| Table 3. Estimated stock numbers at age. | ||||||||
| Year Age | 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 |
| 1981 | 780327 | 190090 | 466830 | 81330 | 22527 | 7082 | 2165 | 2317 |
| 1982 | 815815 | 261956 | 69965 | 210018 | 36008 | 9739 | 3132 | 2291 |
| 1983 | 1055954 | 267073 | 78082 | 31028 | 89449 | 14751 | 3960 | 2547 |
| 1984 | 869442 | 360802 | 79311 | 26672 | 11352 | 32150 | 4824 | 2657 |
| 1985 | 739613 | 282810 | 109545 | 26770 | 7595 | 3379 | 9222 | 2570 |
| 1986 | 1320024 | 225854 | 94532 | 35950 | 7271 | 1710 | 765 | 3063 |
| 1987 | 494223 | 493986 | 85885 | 36574 | 12402 | 2254 | 506 | 1607 |
| 1988 | 726171 | 141336 | 155615 | 32011 | 11366 | 3486 | 572 | 845 |
| 1989 | 643165 | 239727 | 38349 | 46207 | 10454 | 2835 | 791 | 499 |
| 1990 | 869897 | 197653 | 84954 | 11382 | 13511 | 3231 | 691 | 439 |
| 1991 | 1172811 | 281850 | 63631 | 38077 | 4200 | 4679 | 1098 | 477 |
| 1992 | 808745 | 402354 | 99166 | 24303 | 16265 | 1624 | 1609 | 687 |
| 1993 | 817273 | 254386 | 140869 | 36977 | 9147 | 6468 | 613 | 1021 |
| 1994 | 772248 | 269071 | 92642 | 53988 | 14135 | 3452 | 2449 | 788 |
| 1995 | 724458 | 253562 | 105235 | 38669 | 19898 | 5290 | 1302 | 1449 |
| 1996 | 677304 | 234974 | 91541 | 39263 | 14229 | 6585 | 1864 | 1243 |
| 1997 | 675371 | 208970 | 70198 | 33100 | 12463 | 4224 | 1785 | 1257 |
| 1998 | 432877 | 223993 | 65897 | 21046 | 11381 | 3480 | 1240 | 1354 |
| 1999 | 893457 | 124274 | 66803 | 16245 | 5685 | 3107 | 780 | 1037 |
| 2000 | 351419 | 320251 | 41166 | 17198 | 3476 | 1365 | 777 | 738 |
| 2001 | 221568 | 99597 | 93979 | 12434 | 3774 | 952 | 328 | 568 |
| 2002 | 304459 | 67220 | 35480 | 28822 | 3966 | 1202 | 303 | 420 |
| 2003 | 225818 | 97545 | 18114 | 13316 | 8523 | 1481 | 516 | 352 |
| 2004 | 127348 | 76385 | 29982 | 5589 | 4475 | 3284 | 586 | 473 |
| 2005 | 113435 | 38145 | 22782 | 9245 | 1727 | 1469 | 1218 | 549 |
| 2006 | 72924 | 37620 | 13486 | 8865 | 3614 | 788 | 718 | 994 |
| 2007 | 65213 | 22218 | 14637 | 5966 | 3702 | 1799 | 410 | 999 |
| 2008 | 100065 | 21273 | 8100 | 7159 | 2781 | 1982 | 869 | 817 |
| 2009 | 317962 | 34547 | 9864 | 4192 | 3702 | 1454 | 1084 | 978 |
| 2010 | 98176 | 122392 | 14792 | 5010 | 2143 | 2174 | 773 | 1240 |
| 2011 | 212034 | 26754 | 46749 | 7727 | 2688 | 1084 | 1292 | 1110 |
| 2012 | 106547 | 76205 | 11970 | 20469 | 5248 | 1291 | 634 | 1326 |
| 2013 | 243538 | 33214 | 28283 | 7225 | 11050 | 2726 | 769 | 1150 |
| 2014 | 472313 | 81298 | 10457 | 11975 | 4440 | 5418 | 1590 | 1208 |
| 2015 | 317270 | 158607 | 27476 | 6653 | 7395 | 2560 | 3541 | 1737 |
| 2016 | 260146 | 99967 | 69949 | 13619 | 3690 | 4311 | 1525 | 3209 |
| 2017 | 205601 | 89903 | 38291 | 35825 | 7693 | 2121 | 2345 | 2487 |
| 2018 | 415993 | 60892 | 36841 | 19660 | 16649 | 4100 | 1094 | 2464 |
| 2019 | 449787 | 151624 | 23057 | 17912 | 10158 | 7690 | 2272 | 1867 |
| 2020 | 181163 | 168520 | 54678 | 12100 | 10082 | 5206 | 4185 | 2130 |
| 2021 | 144948 | 57068 | 62504 | 22642 | 7048 | 6105 | 2964 | 3350 |
| 2022 | 144098 | 46146 | 24187 | 28523 | 10730 | 4131 | 3778 | 3043 |
| 2023 | 263213 | 48348 | 20259 | 13731 | 14438 | 5068 | 2355 | 3967 |
| 2024 | 262360 | 91169 | 24213 | 11150 | 7460 | 6479 | 2152 | 3891 |
| 2025 | 43232 | 98263 | 36509 | 13229 | 6294 | 4364 | 3308 | 3472 |
| 2026 | 43232 | 12709 | 37421 | 18428 | 7545 | 3599 | 2404 | 4175 |