| Year | United States | China | United Kingdom |
|---|---|---|---|
| 1996 | 13523 | 29 | 2899 |
| 1997 | 13729 | 34 | 2878 |
| 1998 | 13436 | 102 | 2732 |
| 1999 | 13670 | 91 | 3154 |
| 2000 | 14592 | 57 | 3346 |
| 2001 | 14604 | 49 | 3189 |
| 2002 | 14810 | 59 | 3433 |
| 2003 | 15141 | 90 | 3775 |
| 2004 | 15897 | 121 | 3981 |
| 2005 | 16542 | 133 | 4155 |
| 2006 | 17515 | 158 | 4528 |
| 2007 | 17250 | 225 | 4870 |
| 2008 | 17250 | 277 | 4648 |
| 2009 | 19869 | 486 | 5315 |
| 2010 | 20983 | 569 | 5708 |
| 2011 | 22234 | 707 | 6024 |
| 2012 | 23005 | 849 | 6090 |
| 2013 | 24013 | 1037 | 6591 |
| 2014 | 25745 | 1243 | 6762 |
| 2015 | 25959 | 1844 | 7152 |
| 2016 | 26059 | 1931 | 7517 |
| 2017 | 27232 | 2116 | 7955 |
| 2018 | 28208 | 2543 | 8013 |
| 2019 | 28859 | 3334 | 8077 |
| 2020 | 29267 | 5395 | 8602 |
| 2021 | 31593 | 6957 | 9282 |
| 2022 | 31509 | 10288 | 9185 |
| 2023 | 30407 | 10014 | 9220 |
| 2024 | 33260 | 12685 | 10353 |
| Year | United States | China | United Kingdom |
|---|---|---|---|
| 1996 | 13278 | 29 | 2816 |
| 1997 | 13410 | 34 | 2795 |
| 1998 | 13092 | 102 | 2644 |
| 1999 | 13246 | 90 | 2968 |
| 2000 | 14146 | 57 | 3164 |
| 2001 | 14003 | 49 | 2979 |
| 2002 | 14060 | 59 | 3134 |
| 2003 | 14458 | 89 | 3482 |
| 2004 | 15184 | 119 | 3659 |
| 2005 | 15810 | 129 | 3826 |
| 2006 | 16592 | 156 | 4161 |
| 2007 | 16250 | 224 | 4506 |
| 2008 | 16345 | 274 | 4263 |
| 2009 | 18864 | 480 | 4896 |
| 2010 | 19845 | 560 | 5286 |
| 2011 | 21051 | 687 | 5587 |
| 2012 | 21909 | 838 | 5646 |
| 2013 | 22787 | 1023 | 6208 |
| 2014 | 24499 | 1228 | 6275 |
| 2015 | 24654 | 1825 | 6657 |
| 2016 | 24519 | 1899 | 6908 |
| 2017 | 25568 | 2070 | 7239 |
| 2018 | 26436 | 2509 | 7336 |
| 2019 | 27132 | 3258 | 7452 |
| 2020 | 27526 | 5270 | 7886 |
| 2021 | 29976 | 6891 | 8714 |
| 2022 | 29889 | 10141 | 8546 |
| 2023 | 28537 | 9788 | 8591 |
| 2024 | 31574 | 12511 | 9743 |
| Year | United States | China | United Kingdom |
|---|---|---|---|
| 1996 | 245 | 0 | 83 |
| 1997 | 319 | 0 | 83 |
| 1998 | 344 | 0 | 88 |
| 1999 | 424 | 1 | 186 |
| 2000 | 446 | 0 | 182 |
| 2001 | 601 | 0 | 210 |
| 2002 | 750 | 0 | 299 |
| 2003 | 683 | 1 | 293 |
| 2004 | 713 | 2 | 322 |
| 2005 | 732 | 4 | 329 |
| 2006 | 923 | 2 | 367 |
| 2007 | 1000 | 1 | 364 |
| 2008 | 905 | 3 | 385 |
| 2009 | 1005 | 6 | 419 |
| 2010 | 1138 | 9 | 422 |
| 2011 | 1183 | 20 | 437 |
| 2012 | 1096 | 11 | 444 |
| 2013 | 1226 | 14 | 383 |
| 2014 | 1246 | 15 | 487 |
| 2015 | 1305 | 19 | 495 |
| 2016 | 1540 | 32 | 609 |
| 2017 | 1664 | 46 | 716 |
| 2018 | 1772 | 34 | 677 |
| 2019 | 1727 | 76 | 625 |
| 2020 | 1741 | 125 | 716 |
| 2021 | 1617 | 66 | 568 |
| 2022 | 1620 | 147 | 639 |
| 2023 | 1870 | 226 | 629 |
| 2024 | 1686 | 174 | 610 |
| Year | United States | China | United Kingdom |
|---|---|---|---|
| 1996 | 12535 | 28 | 2586 |
| 1997 | 12783 | 34 | 2618 |
| 1998 | 12536 | 75 | 2493 |
| 1999 | 12792 | 62 | 2804 |
| 2000 | 13795 | 56 | 2991 |
| 2001 | 13780 | 47 | 2892 |
| 2002 | 13995 | 57 | 3045 |
| 2003 | 14362 | 89 | 3377 |
| 2004 | 15058 | 116 | 3606 |
| 2005 | 15668 | 132 | 3760 |
| 2006 | 16633 | 150 | 4141 |
| 2007 | 16381 | 220 | 4503 |
| 2008 | 16495 | 271 | 4314 |
| 2009 | 18920 | 438 | 4907 |
| 2010 | 19880 | 538 | 5242 |
| 2011 | 21146 | 689 | 5552 |
| 2012 | 21888 | 826 | 5649 |
| 2013 | 22991 | 1004 | 6156 |
| 2014 | 24627 | 1212 | 6258 |
| 2015 | 24748 | 1782 | 6657 |
| 2016 | 24774 | 1880 | 6943 |
| 2017 | 25852 | 2039 | 7320 |
| 2018 | 26771 | 2455 | 7429 |
| 2019 | 27306 | 3207 | 7522 |
| 2020 | 27476 | 4744 | 7923 |
| 2021 | 29164 | 6211 | 8530 |
| 2022 | 27664 | 9011 | 8069 |
| 2023 | 22839 | 7560 | 7241 |
| 2024 | 12225 | 4567 | 4146 |
| Year | United States | China | United Kingdom |
|---|---|---|---|
| 1996 | 988 | 1 | 313 |
| 1997 | 946 | 0 | 260 |
| 1998 | 900 | 27 | 239 |
| 1999 | 878 | 29 | 350 |
| 2000 | 797 | 1 | 355 |
| 2001 | 824 | 2 | 297 |
| 2002 | 815 | 2 | 388 |
| 2003 | 779 | 1 | 398 |
| 2004 | 839 | 5 | 375 |
| 2005 | 874 | 1 | 395 |
| 2006 | 882 | 8 | 387 |
| 2007 | 869 | 5 | 367 |
| 2008 | 755 | 6 | 334 |
| 2009 | 949 | 48 | 408 |
| 2010 | 1103 | 31 | 466 |
| 2011 | 1088 | 18 | 472 |
| 2012 | 1117 | 23 | 441 |
| 2013 | 1022 | 33 | 435 |
| 2014 | 1118 | 31 | 504 |
| 2015 | 1211 | 62 | 495 |
| 2016 | 1285 | 51 | 574 |
| 2017 | 1380 | 77 | 635 |
| 2018 | 1437 | 88 | 584 |
| 2019 | 1553 | 127 | 555 |
| 2020 | 1791 | 651 | 679 |
| 2021 | 2429 | 746 | 752 |
| 2022 | 3845 | 1277 | 1116 |
| 2023 | 7568 | 2454 | 1979 |
| 2024 | 21035 | 8118 | 6207 |
| Year | United States | China | United Kingdom |
|---|---|---|---|
| 1996 | 813006 | 1452 | 129932 |
| 1997 | 864899 | 1163 | 146067 |
| 1998 | 873351 | 1280 | 148383 |
| 1999 | 863717 | 3621 | 161053 |
| 2000 | 1198842 | 3069 | 231627 |
| 2001 | 1118493 | 3323 | 207370 |
| 2002 | 1127275 | 5656 | 198891 |
| 2003 | 1254641 | 4963 | 225334 |
| 2004 | 1218491 | 8883 | 273545 |
| 2005 | 1173136 | 9005 | 246965 |
| 2006 | 1222894 | 10208 | 388593 |
| 2007 | 1167107 | 14265 | 275381 |
| 2008 | 1084287 | 16480 | 279746 |
| 2009 | 1191473 | 21436 | 285156 |
| 2010 | 1218968 | 25377 | 284989 |
| 2011 | 1158329 | 32922 | 265956 |
| 2012 | 1075249 | 33998 | 270352 |
| 2013 | 1032125 | 41781 | 291547 |
| 2014 | 991673 | 48631 | 267618 |
| 2015 | 949203 | 57945 | 252958 |
| 2016 | 818825 | 58918 | 245662 |
| 2017 | 793667 | 63199 | 255009 |
| 2018 | 699860 | 68556 | 221597 |
| 2019 | 591816 | 74990 | 199339 |
| 2020 | 530475 | 103616 | 188583 |
| 2021 | 401599 | 97334 | 158314 |
| 2022 | 238044 | 86280 | 89116 |
| 2023 | 108045 | 42705 | 46715 |
| 2024 | 28055 | 12263 | 11185 |
| Year | United States | China | United Kingdom |
|---|---|---|---|
| 1996 | 368764 | 1246 | 92518 |
| 1997 | 399291 | 853 | 104316 |
| 1998 | 407654 | 904 | 106884 |
| 1999 | 401150 | 2735 | 115177 |
| 2000 | 596661 | 2114 | 171796 |
| 2001 | 549718 | 2509 | 152740 |
| 2002 | 549691 | 4451 | 146563 |
| 2003 | 635095 | 3687 | 167355 |
| 2004 | 604483 | 6498 | 206275 |
| 2005 | 575603 | 6704 | 184572 |
| 2006 | 599939 | 7124 | 290091 |
| 2007 | 571959 | 10101 | 204509 |
| 2008 | 534218 | 11768 | 209199 |
| 2009 | 580796 | 15256 | 212169 |
| 2010 | 607888 | 17798 | 212667 |
| 2011 | 571989 | 22611 | 196564 |
| 2012 | 533778 | 22900 | 201377 |
| 2013 | 509392 | 27548 | 216838 |
| 2014 | 487746 | 32727 | 201320 |
| 2015 | 478845 | 35299 | 187712 |
| 2016 | 416932 | 36212 | 183851 |
| 2017 | 409594 | 39471 | 193619 |
| 2018 | 358747 | 41378 | 166686 |
| 2019 | 306087 | 42020 | 148549 |
| 2020 | 284525 | 61207 | 143982 |
| 2021 | 211150 | 52936 | 118951 |
| 2022 | 120910 | 40217 | 65981 |
| 2023 | 54564 | 20245 | 34380 |
| 2024 | 13416 | 4837 | 7800 |
| Year | United States | China | United Kingdom |
|---|---|---|---|
| 1996 | 444242 | 206 | 37414 |
| 1997 | 465608 | 310 | 41751 |
| 1998 | 465697 | 376 | 41499 |
| 1999 | 462567 | 886 | 45876 |
| 2000 | 602181 | 955 | 59831 |
| 2001 | 568775 | 814 | 54630 |
| 2002 | 577584 | 1205 | 52328 |
| 2003 | 619546 | 1276 | 57979 |
| 2004 | 614008 | 2385 | 67270 |
| 2005 | 597533 | 2301 | 62393 |
| 2006 | 622955 | 3084 | 98502 |
| 2007 | 595148 | 4164 | 70872 |
| 2008 | 550069 | 4712 | 70547 |
| 2009 | 610677 | 6180 | 72987 |
| 2010 | 611080 | 7579 | 72322 |
| 2011 | 586340 | 10311 | 69392 |
| 2012 | 541471 | 11098 | 68975 |
| 2013 | 522733 | 14233 | 74709 |
| 2014 | 503927 | 15904 | 66298 |
| 2015 | 470358 | 22646 | 65246 |
| 2016 | 401893 | 22706 | 61811 |
| 2017 | 384073 | 23728 | 61390 |
| 2018 | 341113 | 27178 | 54911 |
| 2019 | 285729 | 32970 | 50790 |
| 2020 | 245950 | 42409 | 44601 |
| 2021 | 190449 | 44398 | 39363 |
| 2022 | 117134 | 46063 | 23135 |
| 2023 | 53481 | 22460 | 12335 |
| 2024 | 14639 | 7426 | 3385 |
| Year | United States | China | United Kingdom |
|---|---|---|---|
| 1996 | 25.13 | 82.76 | 22.01 |
| 1997 | 8.28 | 67.65 | 14.07 |
| 1998 | 12.06 | 26.47 | 19.33 |
| 1999 | 7.68 | 39.56 | 13.09 |
| 2000 | 8.83 | 71.93 | 15.69 |
| 2001 | 8.99 | 73.47 | 18.00 |
| 2002 | 10.49 | 71.19 | 18.67 |
| 2003 | 12.97 | 71.11 | 22.15 |
| 2004 | 15.12 | 79.34 | 27.13 |
| 2005 | 15.42 | 73.68 | 27.89 |
| 2006 | 16.44 | 71.52 | 30.94 |
| 2007 | 20.82 | 71.56 | 32.57 |
| 2008 | 33.36 | 64.98 | 36.92 |
| 2009 | 18.42 | 53.70 | 34.28 |
| 2010 | 18.59 | 60.28 | 34.90 |
| 2011 | 18.82 | 65.91 | 35.19 |
| 2012 | 20.22 | 61.60 | 38.64 |
| 2013 | 21.28 | 64.03 | 40.81 |
| 2014 | 22.74 | 57.68 | 44.25 |
| 2015 | 23.70 | 53.42 | 45.67 |
| 2016 | 23.99 | 54.79 | 46.35 |
| 2017 | 24.68 | 50.99 | 46.65 |
| 2018 | 25.58 | 50.81 | 50.09 |
| 2019 | 25.89 | 48.26 | 50.13 |
| 2020 | 27.61 | 38.46 | 52.53 |
| 2021 | 28.38 | 37.40 | 55.83 |
| 2022 | 28.47 | 33.63 | 55.70 |
| 2023 | 29.53 | 32.09 | 59.35 |
| 2024 | 29.13 | 30.38 | 57.70 |
| Year | United States | China | United Kingdom |
|---|---|---|---|
| 1996 | 11.39 | 10.34 | 6.31 |
| 1997 | 11.77 | 29.41 | 7.75 |
| 1998 | 11.76 | 17.65 | 9.55 |
| 1999 | 11.53 | 19.78 | 9.51 |
| 2000 | 11.42 | 7.02 | 11.78 |
| 2001 | 10.46 | 8.16 | 11.13 |
| 2002 | 11.44 | 11.86 | 12.85 |
| 2003 | 12.44 | 5.56 | 14.33 |
| 2004 | 13.62 | 7.44 | 15.93 |
| 2005 | 14.02 | 17.29 | 17.16 |
| 2006 | 15.51 | 17.09 | 17.42 |
| 2007 | 19.76 | 16.89 | 20.64 |
| 2008 | 26.56 | 18.05 | 26.01 |
| 2009 | 30.90 | 17.70 | 27.56 |
| 2010 | 32.10 | 28.30 | 30.64 |
| 2011 | 33.06 | 26.59 | 29.96 |
| 2012 | 32.81 | 21.91 | 31.76 |
| 2013 | 34.44 | 23.92 | 36.55 |
| 2014 | 35.53 | 24.46 | 47.13 |
| 2015 | 38.18 | 27.66 | 55.34 |
| 2016 | 39.37 | 32.88 | 67.23 |
| 2017 | 39.52 | 38.00 | 72.58 |
| 2018 | 41.46 | 40.31 | 74.88 |
| 2019 | 43.40 | 41.66 | 74.51 |
| 2020 | 43.89 | 44.97 | 74.68 |
| 2021 | 46.81 | 52.68 | 76.89 |
| 2022 | 48.02 | 62.21 | 79.63 |
| 2023 | 48.66 | 50.31 | 81.20 |
| 2024 | 35.84 | 43.41 | 75.07 |