| Year | United States | China | United Kingdom |
|---|---|---|---|
| 1996 | 47028 | 8602 | 11200 |
| 1997 | 46573 | 9464 | 11715 |
| 1998 | 47775 | 11253 | 11785 |
| 1999 | 48290 | 10327 | 12023 |
| 2000 | 48514 | 12296 | 12837 |
| 2001 | 50128 | 14588 | 12367 |
| 2002 | 54012 | 15772 | 13034 |
| 2003 | 56367 | 17183 | 14226 |
| 2004 | 55684 | 21836 | 14269 |
| 2005 | 61425 | 35657 | 15490 |
| 2006 | 65817 | 40907 | 16934 |
| 2007 | 62285 | 45320 | 16951 |
| 2008 | 61587 | 49514 | 17089 |
| 2009 | 60976 | 53571 | 17408 |
| 2010 | 62483 | 54020 | 17293 |
| 2011 | 64026 | 60301 | 17992 |
| 2012 | 65466 | 61866 | 18006 |
| 2013 | 61488 | 68471 | 17977 |
| 2014 | 63477 | 72300 | 19314 |
| 2015 | 64239 | 78210 | 20692 |
| 2016 | 68883 | 86788 | 21858 |
| 2017 | 68059 | 95315 | 22580 |
| 2018 | 67710 | 110622 | 22017 |
| 2019 | 66266 | 124096 | 22392 |
| 2020 | 64477 | 127826 | 22181 |
| 2021 | 61897 | 148392 | 22372 |
| 2022 | 60708 | 160094 | 21900 |
| 2023 | 56637 | 166863 | 21111 |
| 2024 | 56081 | 176499 | 21008 |
| Year | United States | China | United Kingdom |
|---|---|---|---|
| 1996 | 46486 | 8582 | 11103 |
| 1997 | 46150 | 9428 | 11624 |
| 1998 | 47370 | 11235 | 11706 |
| 1999 | 47914 | 10297 | 11954 |
| 2000 | 48143 | 12267 | 12784 |
| 2001 | 49414 | 14527 | 12171 |
| 2002 | 53321 | 15694 | 12865 |
| 2003 | 55609 | 17105 | 13964 |
| 2004 | 55125 | 21792 | 14111 |
| 2005 | 60627 | 35612 | 15252 |
| 2006 | 64929 | 40836 | 16667 |
| 2007 | 61353 | 45094 | 16652 |
| 2008 | 60637 | 49413 | 16828 |
| 2009 | 59991 | 53450 | 17059 |
| 2010 | 61480 | 53870 | 16947 |
| 2011 | 63148 | 60130 | 17727 |
| 2012 | 64454 | 61705 | 17681 |
| 2013 | 60547 | 68242 | 17644 |
| 2014 | 62460 | 72076 | 19018 |
| 2015 | 63207 | 77921 | 20367 |
| 2016 | 67693 | 86384 | 21458 |
| 2017 | 66863 | 94901 | 22161 |
| 2018 | 66409 | 110118 | 21595 |
| 2019 | 64873 | 123480 | 21893 |
| 2020 | 63024 | 127062 | 21681 |
| 2021 | 60681 | 147629 | 21971 |
| 2022 | 59532 | 159255 | 21461 |
| 2023 | 55371 | 165934 | 20722 |
| 2024 | 54858 | 175452 | 20611 |
| Year | United States | China | United Kingdom |
|---|---|---|---|
| 1996 | 542 | 20 | 97 |
| 1997 | 423 | 36 | 91 |
| 1998 | 405 | 18 | 79 |
| 1999 | 376 | 30 | 69 |
| 2000 | 371 | 29 | 53 |
| 2001 | 714 | 61 | 196 |
| 2002 | 691 | 78 | 169 |
| 2003 | 758 | 78 | 262 |
| 2004 | 559 | 44 | 158 |
| 2005 | 798 | 45 | 238 |
| 2006 | 888 | 71 | 267 |
| 2007 | 932 | 226 | 299 |
| 2008 | 950 | 101 | 261 |
| 2009 | 985 | 121 | 349 |
| 2010 | 1003 | 150 | 346 |
| 2011 | 878 | 171 | 265 |
| 2012 | 1012 | 161 | 325 |
| 2013 | 941 | 229 | 333 |
| 2014 | 1017 | 224 | 296 |
| 2015 | 1032 | 289 | 325 |
| 2016 | 1190 | 404 | 400 |
| 2017 | 1196 | 414 | 419 |
| 2018 | 1301 | 504 | 422 |
| 2019 | 1393 | 616 | 499 |
| 2020 | 1453 | 764 | 500 |
| 2021 | 1216 | 763 | 401 |
| 2022 | 1176 | 839 | 439 |
| 2023 | 1266 | 929 | 389 |
| 2024 | 1223 | 1047 | 397 |
| Year | United States | China | United Kingdom |
|---|---|---|---|
| 1996 | 41048 | 5532 | 10029 |
| 1997 | 41172 | 6770 | 10658 |
| 1998 | 41716 | 7627 | 10679 |
| 1999 | 41946 | 7718 | 10888 |
| 2000 | 42074 | 9489 | 11429 |
| 2001 | 42827 | 11407 | 10958 |
| 2002 | 45622 | 12401 | 11499 |
| 2003 | 47719 | 14408 | 12408 |
| 2004 | 48808 | 18720 | 12897 |
| 2005 | 51149 | 28096 | 13383 |
| 2006 | 53068 | 33036 | 14271 |
| 2007 | 50784 | 36707 | 14169 |
| 2008 | 51436 | 40801 | 14669 |
| 2009 | 50919 | 43367 | 14802 |
| 2010 | 52415 | 45353 | 15048 |
| 2011 | 53545 | 50502 | 15573 |
| 2012 | 56230 | 53559 | 15791 |
| 2013 | 53000 | 58708 | 15842 |
| 2014 | 54291 | 62646 | 16937 |
| 2015 | 54832 | 66882 | 17975 |
| 2016 | 58735 | 73563 | 19296 |
| 2017 | 58182 | 81243 | 19660 |
| 2018 | 58145 | 93503 | 19529 |
| 2019 | 56799 | 104053 | 19670 |
| 2020 | 56157 | 107644 | 19872 |
| 2021 | 52900 | 120187 | 19610 |
| 2022 | 49090 | 124913 | 18497 |
| 2023 | 43145 | 114233 | 16605 |
| 2024 | 24224 | 65146 | 9707 |
| Year | United States | China | United Kingdom |
|---|---|---|---|
| 1996 | 5980 | 3070 | 1171 |
| 1997 | 5401 | 2694 | 1057 |
| 1998 | 6059 | 3626 | 1106 |
| 1999 | 6344 | 2609 | 1135 |
| 2000 | 6440 | 2807 | 1408 |
| 2001 | 7301 | 3181 | 1409 |
| 2002 | 8390 | 3371 | 1535 |
| 2003 | 8648 | 2775 | 1818 |
| 2004 | 6876 | 3116 | 1372 |
| 2005 | 10276 | 7561 | 2107 |
| 2006 | 12749 | 7871 | 2663 |
| 2007 | 11501 | 8613 | 2782 |
| 2008 | 10151 | 8713 | 2420 |
| 2009 | 10057 | 10204 | 2606 |
| 2010 | 10068 | 8667 | 2245 |
| 2011 | 10481 | 9799 | 2419 |
| 2012 | 9236 | 8307 | 2215 |
| 2013 | 8488 | 9763 | 2135 |
| 2014 | 9186 | 9654 | 2377 |
| 2015 | 9407 | 11328 | 2717 |
| 2016 | 10148 | 13225 | 2562 |
| 2017 | 9877 | 14072 | 2920 |
| 2018 | 9565 | 17119 | 2488 |
| 2019 | 9467 | 20043 | 2722 |
| 2020 | 8320 | 20182 | 2309 |
| 2021 | 8997 | 28205 | 2762 |
| 2022 | 11618 | 35181 | 3403 |
| 2023 | 13492 | 52630 | 4506 |
| 2024 | 31857 | 111353 | 11301 |
| Year | United States | China | United Kingdom |
|---|---|---|---|
| 1996 | 1999258 | 90777 | 367411 |
| 1997 | 1780962 | 111274 | 426437 |
| 1998 | 2018090 | 133798 | 431332 |
| 1999 | 1969951 | 142713 | 461470 |
| 2000 | 2027664 | 197476 | 524518 |
| 2001 | 2037653 | 227010 | 476927 |
| 2002 | 2090610 | 281675 | 520766 |
| 2003 | 2342193 | 370793 | 565886 |
| 2004 | 2391207 | 458367 | 587934 |
| 2005 | 2401453 | 588299 | 626367 |
| 2006 | 2403918 | 723167 | 669318 |
| 2007 | 2326738 | 791741 | 692607 |
| 2008 | 2465716 | 943395 | 661298 |
| 2009 | 2395661 | 964539 | 721271 |
| 2010 | 2488224 | 1063850 | 686587 |
| 2011 | 2311274 | 1128231 | 666051 |
| 2012 | 2417360 | 1298202 | 688342 |
| 2013 | 2300817 | 1356297 | 700124 |
| 2014 | 2261597 | 1504072 | 733253 |
| 2015 | 2144159 | 1602492 | 745038 |
| 2016 | 2094442 | 1659765 | 745194 |
| 2017 | 1911490 | 1861614 | 681396 |
| 2018 | 1826221 | 2115902 | 628830 |
| 2019 | 1592276 | 2139116 | 566946 |
| 2020 | 1390965 | 1998169 | 524366 |
| 2021 | 1013270 | 1753250 | 400038 |
| 2022 | 606901 | 1382058 | 249490 |
| 2023 | 321988 | 785268 | 136340 |
| 2024 | 76529 | 210091 | 33183 |
| Year | United States | China | United Kingdom |
|---|---|---|---|
| 1996 | 1258509 | 51381 | 290914 |
| 1997 | 1082326 | 63060 | 336385 |
| 1998 | 1239424 | 73938 | 339722 |
| 1999 | 1215050 | 76435 | 367721 |
| 2000 | 1248058 | 104441 | 418265 |
| 2001 | 1241330 | 116386 | 374486 |
| 2002 | 1277343 | 143521 | 411810 |
| 2003 | 1436512 | 186996 | 443074 |
| 2004 | 1472365 | 226125 | 460852 |
| 2005 | 1485458 | 277738 | 491755 |
| 2006 | 1470462 | 340116 | 521536 |
| 2007 | 1421008 | 351655 | 546643 |
| 2008 | 1528362 | 432108 | 511493 |
| 2009 | 1477359 | 429136 | 563592 |
| 2010 | 1533238 | 467784 | 525893 |
| 2011 | 1417636 | 481390 | 502023 |
| 2012 | 1485285 | 547162 | 521770 |
| 2013 | 1408066 | 551513 | 525175 |
| 2014 | 1404526 | 597427 | 559618 |
| 2015 | 1325831 | 613501 | 565813 |
| 2016 | 1299872 | 623165 | 570413 |
| 2017 | 1197526 | 682691 | 521580 |
| 2018 | 1146839 | 742156 | 480423 |
| 2019 | 1015623 | 742937 | 436702 |
| 2020 | 891984 | 672186 | 405596 |
| 2021 | 645389 | 523807 | 308698 |
| 2022 | 375192 | 372352 | 190290 |
| 2023 | 195188 | 202354 | 101249 |
| 2024 | 43993 | 52608 | 23904 |
| Year | United States | China | United Kingdom |
|---|---|---|---|
| 1996 | 740749 | 39396 | 76497 |
| 1997 | 698636 | 48214 | 90052 |
| 1998 | 778666 | 59860 | 91610 |
| 1999 | 754901 | 66278 | 93749 |
| 2000 | 779606 | 93035 | 106253 |
| 2001 | 796323 | 110624 | 102441 |
| 2002 | 813267 | 138154 | 108956 |
| 2003 | 905681 | 183797 | 122812 |
| 2004 | 918842 | 232242 | 127082 |
| 2005 | 915995 | 310561 | 134612 |
| 2006 | 933456 | 383051 | 147782 |
| 2007 | 905730 | 440086 | 145964 |
| 2008 | 937354 | 511287 | 149805 |
| 2009 | 918302 | 535403 | 157679 |
| 2010 | 954986 | 596066 | 160694 |
| 2011 | 893638 | 646841 | 164028 |
| 2012 | 932075 | 751040 | 166572 |
| 2013 | 892751 | 804784 | 174949 |
| 2014 | 857071 | 906645 | 173635 |
| 2015 | 818328 | 988991 | 179225 |
| 2016 | 794570 | 1036600 | 174781 |
| 2017 | 713964 | 1178923 | 159816 |
| 2018 | 679382 | 1373746 | 148407 |
| 2019 | 576653 | 1396179 | 130244 |
| 2020 | 498981 | 1325983 | 118770 |
| 2021 | 367881 | 1229443 | 91340 |
| 2022 | 231709 | 1009706 | 59200 |
| 2023 | 126800 | 582914 | 35091 |
| 2024 | 32536 | 157483 | 9279 |
| Year | United States | China | United Kingdom |
|---|---|---|---|
| 1996 | 27.61 | 18.61 | 43.13 |
| 1997 | 28.50 | 21.16 | 45.69 |
| 1998 | 28.58 | 19.43 | 46.81 |
| 1999 | 28.07 | 19.84 | 46.07 |
| 2000 | 30.47 | 21.44 | 45.52 |
| 2001 | 31.15 | 19.27 | 48.44 |
| 2002 | 31.48 | 21.49 | 49.51 |
| 2003 | 34.98 | 24.36 | 54.05 |
| 2004 | 35.13 | 20.87 | 55.61 |
| 2005 | 34.43 | 15.28 | 55.64 |
| 2006 | 35.28 | 15.64 | 55.40 |
| 2007 | 37.66 | 15.44 | 56.83 |
| 2008 | 38.52 | 15.45 | 58.54 |
| 2009 | 38.56 | 15.63 | 59.24 |
| 2010 | 38.94 | 17.02 | 60.43 |
| 2011 | 40.05 | 17.18 | 61.32 |
| 2012 | 41.83 | 18.21 | 63.35 |
| 2013 | 43.55 | 17.83 | 65.37 |
| 2014 | 44.64 | 19.05 | 66.16 |
| 2015 | 45.10 | 19.61 | 66.08 |
| 2016 | 46.20 | 20.96 | 67.71 |
| 2017 | 46.94 | 21.37 | 68.94 |
| 2018 | 49.05 | 21.35 | 71.29 |
| 2019 | 49.29 | 21.10 | 71.17 |
| 2020 | 50.59 | 21.16 | 73.44 |
| 2021 | 50.64 | 18.18 | 74.42 |
| 2022 | 49.93 | 17.42 | 74.44 |
| 2023 | 50.98 | 16.19 | 74.80 |
| 2024 | 53.15 | 16.86 | 77.61 |
| Year | United States | China | United Kingdom |
|---|---|---|---|
| 1996 | 19.58 | 11.68 | 16.63 |
| 1997 | 22.00 | 11.70 | 20.44 |
| 1998 | 22.77 | 12.52 | 23.33 |
| 1999 | 23.82 | 13.58 | 22.80 |
| 2000 | 25.25 | 13.39 | 24.64 |
| 2001 | 25.69 | 14.18 | 28.12 |
| 2002 | 26.72 | 14.12 | 30.44 |
| 2003 | 27.61 | 14.32 | 30.90 |
| 2004 | 27.89 | 16.19 | 33.70 |
| 2005 | 28.10 | 18.81 | 35.18 |
| 2006 | 29.02 | 18.96 | 36.42 |
| 2007 | 29.84 | 17.97 | 37.13 |
| 2008 | 33.93 | 20.88 | 42.20 |
| 2009 | 36.58 | 21.35 | 43.82 |
| 2010 | 38.15 | 20.84 | 46.49 |
| 2011 | 40.16 | 21.54 | 48.55 |
| 2012 | 42.74 | 23.32 | 52.94 |
| 2013 | 43.58 | 24.30 | 54.90 |
| 2014 | 46.91 | 25.17 | 62.24 |
| 2015 | 51.91 | 26.28 | 66.71 |
| 2016 | 52.71 | 26.45 | 70.98 |
| 2017 | 54.23 | 29.86 | 74.21 |
| 2018 | 57.02 | 32.93 | 76.05 |
| 2019 | 58.55 | 36.82 | 75.36 |
| 2020 | 64.15 | 42.48 | 79.55 |
| 2021 | 67.25 | 43.27 | 80.06 |
| 2022 | 67.21 | 36.57 | 80.21 |
| 2023 | 65.13 | 36.26 | 78.67 |
| 2024 | 60.05 | 34.69 | 75.17 |