| Table 3. Estimated stock numbers at age. | |||||||
| Year Age | 0 | 1 | 2 | 3 | 4 | 5 | 6 |
| 1980 | 1920138 | 475314 | 152956 | 26670 | 9327 | 1289 | 4224 |
| 1981 | 1825438 | 210959 | 144852 | 52556 | 7611 | 2783 | 2260 |
| 1982 | 1868827 | 197574 | 64030 | 49132 | 14613 | 2217 | 1907 |
| 1983 | 2041731 | 203227 | 58813 | 21455 | 13189 | 4108 | 1537 |
| 1984 | 2057627 | 224276 | 59786 | 19043 | 5510 | 3550 | 1957 |
| 1985 | 2015144 | 224239 | 64923 | 18898 | 4585 | 1410 | 1904 |
| 1986 | 1941515 | 219860 | 63710 | 20210 | 4407 | 1128 | 1202 |
| 1987 | 1717602 | 212801 | 62298 | 19688 | 4653 | 1066 | 825 |
| 1988 | 1631720 | 184932 | 60205 | 19291 | 4498 | 1114 | 652 |
| 1989 | 1496898 | 178626 | 50993 | 18427 | 4250 | 1025 | 580 |
| 1990 | 1366339 | 162394 | 48877 | 14881 | 3711 | 875 | 499 |
| 1991 | 1179727 | 150004 | 43704 | 14405 | 2858 | 728 | 417 |
| 1992 | 862271 | 130295 | 40555 | 12724 | 2738 | 527 | 339 |
| 1993 | 794017 | 92351 | 35881 | 12029 | 2358 | 478 | 253 |
| 1994 | 720795 | 86862 | 25684 | 10497 | 2397 | 439 | 215 |
| 1995 | 711911 | 77171 | 23268 | 7859 | 1896 | 411 | 181 |
| 1996 | 683427 | 77231 | 19725 | 6770 | 1495 | 316 | 160 |
| 1997 | 604058 | 73476 | 18567 | 5385 | 1136 | 226 | 117 |
| 1998 | 623233 | 63574 | 16860 | 4825 | 937 | 187 | 85 |
| 1999 | 572463 | 67379 | 12788 | 3824 | 708 | 139 | 63 |
| 2000 | 498361 | 60766 | 12855 | 2635 | 494 | 93 | 44 |
| 2001 | 502541 | 52590 | 10351 | 2444 | 366 | 69 | 31 |
| 2002 | 419375 | 53167 | 8326 | 1758 | 288 | 50 | 22 |
| 2003 | 385771 | 43992 | 7607 | 1343 | 196 | 34 | 15 |
| 2004 | 339176 | 40223 | 6044 | 1129 | 156 | 26 | 12 |
| 2005 | 305013 | 34748 | 4231 | 754 | 100 | 17 | 8 |
| 2006 | 311501 | 31301 | 3352 | 486 | 64 | 10 | 5 |
| 2007 | 315614 | 31848 | 2865 | 368 | 44 | 7 | 4 |
| 2008 | 301481 | 33097 | 3003 | 336 | 38 | 6 | 3 |
| 2009 | 280856 | 31262 | 3564 | 365 | 40 | 6 | 3 |
| 2010 | 279079 | 28844 | 3444 | 462 | 51 | 8 | 4 |
| 2011 | 288660 | 28681 | 3090 | 476 | 63 | 10 | 5 |
| 2012 | 266359 | 29959 | 3236 | 436 | 65 | 12 | 6 |
| 2013 | 312040 | 27100 | 3426 | 480 | 64 | 13 | 7 |
| 2014 | 314098 | 32787 | 3285 | 523 | 77 | 14 | 8 |
| 2015 | 296645 | 32854 | 4319 | 517 | 83 | 16 | 9 |
| 2016 | 306826 | 31091 | 5000 | 780 | 99 | 19 | 10 |
| 2017 | 327655 | 32796 | 5322 | 937 | 141 | 23 | 11 |
| 2018 | 368330 | 34679 | 6040 | 1047 | 166 | 29 | 13 |
| 2019 | 392327 | 39064 | 6186 | 1170 | 168 | 30 | 14 |
| 2020 | 390594 | 41575 | 6884 | 1065 | 162 | 27 | 14 |
| 2021 | 408620 | 41334 | 7421 | 1204 | 150 | 26 | 12 |
| 2022 | 356397 | 44443 | 7414 | 1173 | 164 | 23 | 11 |
| 2023 | 358768 | 37860 | 8990 | 1365 | 176 | 30 | 11 |