| Year | United States | China | United Kingdom |
|---|---|---|---|
| 1996 | 4763 | 25 | 1274 |
| 1997 | 5384 | 56 | 1521 |
| 1998 | 5304 | 42 | 1602 |
| 1999 | 5491 | 70 | 1730 |
| 2000 | 5623 | 85 | 1933 |
| 2001 | 5879 | 76 | 1913 |
| 2002 | 6572 | 108 | 2039 |
| 2003 | 7124 | 131 | 2210 |
| 2004 | 7641 | 173 | 2445 |
| 2005 | 8151 | 208 | 2554 |
| 2006 | 8736 | 397 | 2780 |
| 2007 | 8596 | 655 | 3049 |
| 2008 | 8851 | 655 | 2950 |
| 2009 | 10734 | 1320 | 3706 |
| 2010 | 10682 | 1468 | 3602 |
| 2011 | 10951 | 2975 | 3803 |
| 2012 | 11187 | 1762 | 4068 |
| 2013 | 11265 | 1727 | 4340 |
| 2014 | 11896 | 1943 | 4517 |
| 2015 | 11996 | 2184 | 4612 |
| 2016 | 12051 | 2768 | 4910 |
| 2017 | 12344 | 3074 | 4944 |
| 2018 | 13063 | 3735 | 5282 |
| 2019 | 12416 | 5342 | 5127 |
| 2020 | 12825 | 6205 | 5540 |
| 2021 | 13246 | 7923 | 5898 |
| 2022 | 13276 | 10032 | 5900 |
| 2023 | 13461 | 12619 | 6113 |
| 2024 | 14193 | 15768 | 6980 |
| Year | United States | China | United Kingdom |
|---|---|---|---|
| 1996 | 4713 | 25 | 1252 |
| 1997 | 5346 | 56 | 1495 |
| 1998 | 5270 | 41 | 1579 |
| 1999 | 5443 | 70 | 1697 |
| 2000 | 5557 | 85 | 1905 |
| 2001 | 5781 | 76 | 1890 |
| 2002 | 6378 | 107 | 1988 |
| 2003 | 6809 | 131 | 2114 |
| 2004 | 7357 | 173 | 2354 |
| 2005 | 7728 | 205 | 2460 |
| 2006 | 8119 | 390 | 2645 |
| 2007 | 8016 | 646 | 2891 |
| 2008 | 8312 | 644 | 2826 |
| 2009 | 10096 | 1295 | 3509 |
| 2010 | 10049 | 1451 | 3388 |
| 2011 | 10357 | 2947 | 3545 |
| 2012 | 10561 | 1714 | 3851 |
| 2013 | 10666 | 1686 | 4063 |
| 2014 | 11039 | 1893 | 4129 |
| 2015 | 11146 | 2116 | 4216 |
| 2016 | 11113 | 2650 | 4417 |
| 2017 | 11398 | 2887 | 4455 |
| 2018 | 11889 | 3587 | 4842 |
| 2019 | 11608 | 5110 | 4797 |
| 2020 | 11915 | 5975 | 5166 |
| 2021 | 12262 | 7595 | 5418 |
| 2022 | 12388 | 9629 | 5457 |
| 2023 | 12546 | 12119 | 5710 |
| 2024 | 13344 | 15612 | 6568 |
| Year | United States | China | United Kingdom |
|---|---|---|---|
| 1996 | 50 | 0 | 22 |
| 1997 | 38 | 0 | 26 |
| 1998 | 34 | 1 | 23 |
| 1999 | 48 | 0 | 33 |
| 2000 | 66 | 0 | 28 |
| 2001 | 98 | 0 | 23 |
| 2002 | 194 | 1 | 51 |
| 2003 | 315 | 0 | 96 |
| 2004 | 284 | 0 | 91 |
| 2005 | 423 | 3 | 94 |
| 2006 | 617 | 7 | 135 |
| 2007 | 580 | 9 | 158 |
| 2008 | 539 | 11 | 124 |
| 2009 | 638 | 25 | 197 |
| 2010 | 633 | 17 | 214 |
| 2011 | 594 | 28 | 258 |
| 2012 | 626 | 48 | 217 |
| 2013 | 599 | 41 | 277 |
| 2014 | 857 | 50 | 388 |
| 2015 | 850 | 68 | 396 |
| 2016 | 938 | 118 | 493 |
| 2017 | 946 | 187 | 489 |
| 2018 | 1174 | 148 | 440 |
| 2019 | 808 | 232 | 330 |
| 2020 | 910 | 230 | 374 |
| 2021 | 984 | 328 | 480 |
| 2022 | 888 | 403 | 443 |
| 2023 | 915 | 500 | 403 |
| 2024 | 849 | 156 | 412 |
| Year | United States | China | United Kingdom |
|---|---|---|---|
| 1996 | 4342 | 20 | 1122 |
| 1997 | 4953 | 50 | 1406 |
| 1998 | 4886 | 38 | 1456 |
| 1999 | 5057 | 64 | 1601 |
| 2000 | 5194 | 69 | 1781 |
| 2001 | 5434 | 63 | 1788 |
| 2002 | 6090 | 96 | 1916 |
| 2003 | 6559 | 124 | 2038 |
| 2004 | 7042 | 165 | 2282 |
| 2005 | 7391 | 188 | 2401 |
| 2006 | 7787 | 362 | 2584 |
| 2007 | 7606 | 501 | 2816 |
| 2008 | 8029 | 574 | 2753 |
| 2009 | 9619 | 1065 | 3353 |
| 2010 | 9583 | 1193 | 3293 |
| 2011 | 9996 | 1849 | 3456 |
| 2012 | 10089 | 1461 | 3748 |
| 2013 | 10245 | 1547 | 3973 |
| 2014 | 10572 | 1638 | 4045 |
| 2015 | 10625 | 1974 | 4086 |
| 2016 | 10599 | 2386 | 4323 |
| 2017 | 10995 | 2694 | 4312 |
| 2018 | 11548 | 3367 | 4700 |
| 2019 | 11022 | 4683 | 4712 |
| 2020 | 11293 | 5505 | 5034 |
| 2021 | 11329 | 6823 | 5152 |
| 2022 | 10794 | 8501 | 4948 |
| 2023 | 9299 | 9788 | 4523 |
| 2024 | 5229 | 7102 | 3012 |
| Year | United States | China | United Kingdom |
|---|---|---|---|
| 1996 | 421 | 5 | 152 |
| 1997 | 431 | 6 | 115 |
| 1998 | 418 | 4 | 146 |
| 1999 | 434 | 6 | 129 |
| 2000 | 429 | 16 | 152 |
| 2001 | 445 | 13 | 125 |
| 2002 | 482 | 12 | 123 |
| 2003 | 565 | 7 | 172 |
| 2004 | 599 | 8 | 163 |
| 2005 | 760 | 20 | 153 |
| 2006 | 949 | 35 | 196 |
| 2007 | 990 | 154 | 233 |
| 2008 | 822 | 81 | 197 |
| 2009 | 1115 | 255 | 353 |
| 2010 | 1099 | 275 | 309 |
| 2011 | 955 | 1126 | 347 |
| 2012 | 1098 | 301 | 320 |
| 2013 | 1020 | 180 | 367 |
| 2014 | 1324 | 305 | 472 |
| 2015 | 1371 | 210 | 526 |
| 2016 | 1452 | 382 | 587 |
| 2017 | 1349 | 380 | 632 |
| 2018 | 1515 | 368 | 582 |
| 2019 | 1394 | 659 | 415 |
| 2020 | 1532 | 700 | 506 |
| 2021 | 1917 | 1100 | 746 |
| 2022 | 2482 | 1531 | 952 |
| 2023 | 4162 | 2831 | 1590 |
| 2024 | 8964 | 8666 | 3968 |
| Year | United States | China | United Kingdom |
|---|---|---|---|
| 1996 | 278571 | 760 | 48627 |
| 1997 | 299398 | 3123 | 59755 |
| 1998 | 368001 | 2768 | 84544 |
| 1999 | 434797 | 4074 | 76814 |
| 2000 | 424057 | 3210 | 88609 |
| 2001 | 471524 | 2952 | 105918 |
| 2002 | 539802 | 5135 | 98757 |
| 2003 | 557562 | 5698 | 122228 |
| 2004 | 555015 | 14328 | 130960 |
| 2005 | 569010 | 13855 | 139522 |
| 2006 | 546917 | 17680 | 144035 |
| 2007 | 497327 | 19774 | 151016 |
| 2008 | 465066 | 29044 | 140828 |
| 2009 | 551195 | 33050 | 166031 |
| 2010 | 541825 | 43795 | 142495 |
| 2011 | 538017 | 45614 | 145837 |
| 2012 | 496328 | 48617 | 147297 |
| 2013 | 442907 | 49493 | 147514 |
| 2014 | 429918 | 49882 | 148047 |
| 2015 | 383551 | 64694 | 141645 |
| 2016 | 355151 | 70942 | 137504 |
| 2017 | 337070 | 79937 | 126304 |
| 2018 | 301604 | 94303 | 128990 |
| 2019 | 254249 | 110427 | 118954 |
| 2020 | 225769 | 132803 | 109575 |
| 2021 | 180020 | 131006 | 90487 |
| 2022 | 103435 | 124886 | 59500 |
| 2023 | 50796 | 88985 | 31271 |
| 2024 | 13032 | 24677 | 9048 |
| Year | United States | China | United Kingdom |
|---|---|---|---|
| 1996 | 174910 | 491 | 37722 |
| 1997 | 184474 | 1964 | 45720 |
| 1998 | 234782 | 1724 | 67335 |
| 1999 | 275358 | 2377 | 59181 |
| 2000 | 272244 | 1968 | 67798 |
| 2001 | 297633 | 1828 | 85417 |
| 2002 | 344727 | 3121 | 76615 |
| 2003 | 356525 | 3791 | 96678 |
| 2004 | 348766 | 10405 | 103954 |
| 2005 | 361700 | 7728 | 110387 |
| 2006 | 346792 | 10338 | 115176 |
| 2007 | 312335 | 11806 | 121226 |
| 2008 | 299121 | 16021 | 111398 |
| 2009 | 348921 | 18199 | 131872 |
| 2010 | 345792 | 22685 | 111935 |
| 2011 | 342350 | 25337 | 115644 |
| 2012 | 322961 | 26313 | 117464 |
| 2013 | 283475 | 26040 | 116774 |
| 2014 | 279955 | 26041 | 118105 |
| 2015 | 250565 | 33561 | 112958 |
| 2016 | 234524 | 35229 | 110129 |
| 2017 | 225601 | 37886 | 100208 |
| 2018 | 201993 | 41660 | 103488 |
| 2019 | 174366 | 47495 | 95911 |
| 2020 | 158745 | 57080 | 88816 |
| 2021 | 126407 | 47031 | 73130 |
| 2022 | 71773 | 41970 | 48177 |
| 2023 | 35285 | 28733 | 25222 |
| 2024 | 8766 | 7442 | 7102 |
| Year | United States | China | United Kingdom |
|---|---|---|---|
| 1996 | 103661 | 269 | 10905 |
| 1997 | 114924 | 1159 | 14035 |
| 1998 | 133219 | 1044 | 17209 |
| 1999 | 159439 | 1697 | 17633 |
| 2000 | 151813 | 1242 | 20811 |
| 2001 | 173891 | 1124 | 20501 |
| 2002 | 195075 | 2014 | 22142 |
| 2003 | 201037 | 1907 | 25550 |
| 2004 | 206249 | 3923 | 27006 |
| 2005 | 207310 | 6127 | 29135 |
| 2006 | 200125 | 7342 | 28859 |
| 2007 | 184992 | 7968 | 29790 |
| 2008 | 165945 | 13023 | 29430 |
| 2009 | 202274 | 14851 | 34159 |
| 2010 | 196033 | 21110 | 30560 |
| 2011 | 195667 | 20277 | 30193 |
| 2012 | 173367 | 22304 | 29833 |
| 2013 | 159432 | 23453 | 30740 |
| 2014 | 149963 | 23841 | 29942 |
| 2015 | 132986 | 31133 | 28687 |
| 2016 | 120627 | 35713 | 27375 |
| 2017 | 111469 | 42051 | 26096 |
| 2018 | 99611 | 52643 | 25502 |
| 2019 | 79883 | 62932 | 23043 |
| 2020 | 67024 | 75723 | 20759 |
| 2021 | 53613 | 83975 | 17357 |
| 2022 | 31662 | 82916 | 11323 |
| 2023 | 15511 | 60252 | 6049 |
| 2024 | 4266 | 17235 | 1946 |
| Year | United States | China | United Kingdom |
|---|---|---|---|
| 1996 | 17.89 | 56.00 | 24.18 |
| 1997 | 15.06 | 42.86 | 22.16 |
| 1998 | 15.63 | 80.95 | 25.47 |
| 1999 | 16.28 | 44.29 | 24.57 |
| 2000 | 18.96 | 50.59 | 27.11 |
| 2001 | 18.23 | 57.89 | 30.21 |
| 2002 | 17.88 | 60.19 | 29.03 |
| 2003 | 21.52 | 62.60 | 35.16 |
| 2004 | 23.67 | 71.68 | 39.39 |
| 2005 | 23.04 | 63.94 | 37.59 |
| 2006 | 26.42 | 53.65 | 41.29 |
| 2007 | 27.14 | 36.49 | 43.29 |
| 2008 | 32.08 | 46.56 | 47.80 |
| 2009 | 27.28 | 36.82 | 44.58 |
| 2010 | 27.91 | 36.51 | 44.11 |
| 2011 | 28.33 | 21.65 | 47.70 |
| 2012 | 31.76 | 45.40 | 49.95 |
| 2013 | 33.91 | 55.59 | 51.43 |
| 2014 | 32.78 | 52.65 | 52.67 |
| 2015 | 33.81 | 59.48 | 52.80 |
| 2016 | 35.62 | 51.91 | 53.97 |
| 2017 | 36.22 | 53.84 | 54.07 |
| 2018 | 36.66 | 52.58 | 56.76 |
| 2019 | 39.43 | 41.89 | 59.94 |
| 2020 | 41.25 | 43.84 | 61.52 |
| 2021 | 43.45 | 40.25 | 65.01 |
| 2022 | 42.88 | 37.95 | 66.36 |
| 2023 | 44.27 | 34.98 | 67.69 |
| 2024 | 46.44 | 34.11 | 70.14 |
| Year | United States | China | United Kingdom |
|---|---|---|---|
| 1996 | 13.96 | 16.00 | 6.12 |
| 1997 | 14.90 | 16.07 | 9.47 |
| 1998 | 15.33 | 16.67 | 9.43 |
| 1999 | 15.15 | 10.00 | 8.96 |
| 2000 | 15.90 | 16.47 | 11.17 |
| 2001 | 16.92 | 14.47 | 15.11 |
| 2002 | 18.32 | 16.67 | 19.37 |
| 2003 | 19.65 | 10.69 | 18.28 |
| 2004 | 20.55 | 15.61 | 20.65 |
| 2005 | 21.49 | 18.27 | 22.44 |
| 2006 | 21.83 | 18.39 | 22.95 |
| 2007 | 22.41 | 10.53 | 27.16 |
| 2008 | 23.86 | 15.73 | 30.64 |
| 2009 | 24.89 | 10.30 | 35.62 |
| 2010 | 26.47 | 10.15 | 34.29 |
| 2011 | 26.29 | 9.65 | 35.00 |
| 2012 | 26.22 | 18.33 | 35.45 |
| 2013 | 29.16 | 21.77 | 37.40 |
| 2014 | 28.63 | 20.79 | 46.31 |
| 2015 | 32.25 | 26.47 | 52.62 |
| 2016 | 33.81 | 23.30 | 63.03 |
| 2017 | 35.99 | 25.11 | 66.83 |
| 2018 | 36.77 | 30.58 | 70.31 |
| 2019 | 37.23 | 29.76 | 71.06 |
| 2020 | 39.07 | 35.57 | 71.73 |
| 2021 | 40.10 | 35.54 | 74.60 |
| 2022 | 41.45 | 41.40 | 73.64 |
| 2023 | 42.13 | 35.88 | 73.20 |
| 2024 | 37.28 | 25.97 | 67.25 |