| Table 3. Estimated stock numbers at age. | ||||||||
| Year Age | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 |
| 1981 | 17642 | 19708 | 18145 | 7204 | 2017 | 690 | 330 | 762 |
| 1982 | 21747 | 12800 | 13133 | 7805 | 3290 | 1009 | 396 | 660 |
| 1983 | 22986 | 20283 | 7878 | 6400 | 3344 | 1673 | 573 | 650 |
| 1984 | 22204 | 20948 | 14251 | 3328 | 2746 | 1488 | 892 | 709 |
| 1985 | 20846 | 19979 | 14619 | 7279 | 1538 | 1424 | 808 | 948 |
| 1986 | 20839 | 17536 | 14710 | 7010 | 3507 | 784 | 848 | 993 |
| 1987 | 19897 | 19317 | 12248 | 7665 | 3131 | 1856 | 398 | 1044 |
| 1988 | 15716 | 19676 | 13013 | 5317 | 2980 | 1407 | 877 | 820 |
| 1989 | 13300 | 13427 | 14478 | 5951 | 2166 | 1281 | 644 | 886 |
| 1990 | 15603 | 9397 | 9111 | 7413 | 2743 | 1074 | 674 | 780 |
| 1991 | 15888 | 14273 | 5500 | 4565 | 3644 | 1372 | 554 | 773 |
| 1992 | 16710 | 12374 | 9545 | 2391 | 2123 | 2064 | 768 | 738 |
| 1993 | 15382 | 15638 | 7280 | 4165 | 790 | 866 | 1166 | 770 |
| 1994 | 14771 | 11659 | 11278 | 3371 | 1631 | 505 | 444 | 959 |
| 1995 | 17103 | 10048 | 7140 | 5312 | 1446 | 800 | 294 | 707 |
| 1996 | 20394 | 12535 | 6197 | 3216 | 2860 | 935 | 417 | 612 |
| 1997 | 20842 | 16302 | 9383 | 3693 | 2046 | 1915 | 730 | 741 |
| 1998 | 18574 | 19331 | 11260 | 4600 | 2221 | 1270 | 1144 | 1005 |
| 1999 | 18080 | 15979 | 14657 | 6236 | 2624 | 1343 | 929 | 1270 |
| 2000 | 22716 | 13554 | 11137 | 9141 | 3731 | 1479 | 1090 | 1404 |
| 2001 | 22789 | 17163 | 9817 | 6578 | 5776 | 1997 | 979 | 1597 |
| 2002 | 23360 | 19455 | 14273 | 7073 | 4836 | 4442 | 1563 | 1732 |
| 2003 | 21377 | 21325 | 16018 | 11184 | 4636 | 3613 | 3126 | 2333 |
| 2004 | 20022 | 16866 | 17437 | 11649 | 7724 | 2615 | 2351 | 3204 |
| 2005 | 17178 | 17502 | 12433 | 10774 | 7568 | 4867 | 1783 | 3380 |
| 2006 | 21096 | 14123 | 13919 | 8386 | 6431 | 4351 | 2888 | 3096 |
| 2007 | 24398 | 17348 | 11317 | 10201 | 5550 | 3768 | 3065 | 3630 |
| 2008 | 20147 | 21653 | 12274 | 8117 | 7336 | 3445 | 2147 | 4298 |
| 2009 | 17055 | 15282 | 17692 | 8562 | 6282 | 6187 | 2487 | 4305 |
| 2010 | 21907 | 15337 | 12173 | 12762 | 7293 | 5413 | 5334 | 5194 |
| 2011 | 24832 | 15983 | 10680 | 7803 | 9123 | 5455 | 3967 | 7274 |
| 2012 | 22402 | 23259 | 12952 | 9005 | 5794 | 7000 | 4523 | 8392 |
| 2013 | 21903 | 18998 | 18534 | 11452 | 8148 | 5202 | 5761 | 8972 |
| 2014 | 25440 | 20780 | 16825 | 14785 | 9813 | 7402 | 5160 | 11027 |
| 2015 | 16373 | 22349 | 16666 | 13358 | 11162 | 8949 | 5809 | 13131 |
| 2016 | 13061 | 14824 | 18091 | 15364 | 11774 | 10085 | 8452 | 15281 |
| 2017 | 9394 | 12700 | 13016 | 14746 | 14029 | 9879 | 8548 | 17958 |
| 2018 | 10969 | 10438 | 11020 | 10459 | 11364 | 11253 | 8434 | 16742 |
| 2019 | 10134 | 11871 | 10092 | 9194 | 8786 | 9404 | 9537 | 15624 |
| 2020 | 7848 | 8135 | 7596 | 6998 | 6744 | 6307 | 7457 | 16306 |
| 2021 | 8980 | 7548 | 7408 | 5314 | 4984 | 4794 | 4488 | 12797 |
| 2022 | 11144 | 7869 | 5464 | 5563 | 3627 | 3954 | 3680 | 10355 |
| 2023 | 10916 | 9047 | 5153 | 3175 | 3212 | 2540 | 2752 | 7712 |
| 2024 | 11475 | 9709 | 6124 | 2796 | 1507 | 2039 | 1971 | 6032 |
| 2025 | 10161 | 9570 | 6333 | 3804 | 1694 | 789 | 1285 | 5756 |