| Table 3. Estimated stock numbers at age. | ||||||||
| Year Age | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 |
| 1986 | 4704 | 4039 | 3399 | 3076 | 2301 | 1610 | 1811 | 2240 |
| 1987 | 4101 | 4007 | 3287 | 2653 | 2290 | 1679 | 1164 | 2960 |
| 1988 | 3010 | 3497 | 3286 | 2620 | 2067 | 1767 | 1281 | 3149 |
| 1989 | 2870 | 2561 | 2831 | 2572 | 2015 | 1586 | 1342 | 3364 |
| 1990 | 3505 | 2427 | 2005 | 2092 | 1834 | 1414 | 1085 | 3244 |
| 1991 | 5749 | 2967 | 1904 | 1477 | 1490 | 1297 | 971 | 2977 |
| 1992 | 12183 | 4867 | 2318 | 1377 | 1025 | 1029 | 864 | 2637 |
| 1993 | 12515 | 10302 | 3755 | 1615 | 925 | 699 | 682 | 2301 |
| 1994 | 11409 | 10584 | 7898 | 2534 | 1070 | 635 | 470 | 1981 |
| 1995 | 9981 | 9680 | 8244 | 5451 | 1725 | 754 | 443 | 1688 |
| 1996 | 6803 | 8482 | 7583 | 5707 | 3663 | 1196 | 518 | 1441 |
| 1997 | 4462 | 5798 | 6760 | 5431 | 3903 | 2523 | 812 | 1312 |
| 1998 | 3597 | 3796 | 4554 | 4683 | 3539 | 2517 | 1593 | 1338 |
| 1999 | 5435 | 3063 | 2999 | 3190 | 2966 | 2085 | 1366 | 1564 |
| 2000 | 7692 | 4633 | 2437 | 2137 | 2058 | 1776 | 1169 | 1683 |
| 2001 | 8201 | 6580 | 3793 | 1870 | 1569 | 1461 | 1218 | 2018 |
| 2002 | 8647 | 7004 | 5308 | 2805 | 1323 | 1077 | 961 | 2212 |
| 2003 | 7785 | 7371 | 5554 | 3724 | 1840 | 847 | 664 | 2059 |
| 2004 | 8252 | 6624 | 5761 | 3782 | 2314 | 1103 | 486 | 1648 |
| 2005 | 10726 | 7006 | 5098 | 3827 | 2301 | 1361 | 640 | 1310 |
| 2006 | 13975 | 9129 | 5512 | 3612 | 2540 | 1476 | 853 | 1268 |
| 2007 | 14338 | 11907 | 7246 | 3999 | 2473 | 1654 | 907 | 1309 |
| 2008 | 13247 | 12239 | 9586 | 5414 | 2888 | 1731 | 1106 | 1487 |
| 2009 | 11559 | 11310 | 9864 | 7148 | 3852 | 1950 | 1066 | 1547 |
| 2010 | 11700 | 9883 | 9222 | 7564 | 5239 | 2681 | 1221 | 1536 |
| 2011 | 11889 | 10001 | 8037 | 7034 | 5529 | 3663 | 1715 | 1685 |
| 2012 | 12359 | 10178 | 8228 | 6275 | 5257 | 3935 | 2364 | 2051 |
| 2013 | 9508 | 10576 | 8338 | 6340 | 4603 | 3635 | 2418 | 2523 |
| 2014 | 9332 | 8129 | 8590 | 6257 | 4470 | 3010 | 2058 | 2524 |
| 2015 | 12285 | 7988 | 6665 | 6561 | 4525 | 3057 | 1862 | 2624 |
| 2016 | 11850 | 10505 | 6496 | 4974 | 4585 | 2988 | 1821 | 2423 |
| 2017 | 14005 | 10124 | 8475 | 4753 | 3451 | 2998 | 1725 | 2137 |
| 2018 | 13861 | 11956 | 8122 | 6180 | 3333 | 2336 | 1792 | 2001 |
| 2019 | 19912 | 11828 | 9562 | 5958 | 4319 | 2207 | 1328 | 1774 |
| 2020 | 22417 | 16990 | 9463 | 7072 | 4270 | 2951 | 1327 | 1601 |
| 2021 | 23036 | 19140 | 13684 | 7177 | 5233 | 3071 | 1968 | 1815 |
| 2022 | 25660 | 19652 | 15303 | 10242 | 5197 | 3632 | 1969 | 2268 |
| 2023 | 28390 | 21890 | 15709 | 11477 | 7435 | 3657 | 2420 | 2726 |
| 2024 | 27703 | 24258 | 17725 | 12114 | 8631 | 5493 | 2616 | 3628 |