| Table 3. Estimated stock numbers at age. | ||||||||
| Year Age | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 |
| 1986 | 4658 | 3848 | 3247 | 3112 | 2337 | 1613 | 1811 | 2238 |
| 1987 | 4081 | 3996 | 3180 | 2544 | 2268 | 1678 | 1164 | 2972 |
| 1988 | 3162 | 3494 | 3284 | 2579 | 2024 | 1730 | 1258 | 3154 |
| 1989 | 2956 | 2657 | 2817 | 2548 | 2014 | 1609 | 1328 | 3305 |
| 1990 | 3635 | 2461 | 2044 | 2092 | 1823 | 1408 | 1114 | 3192 |
| 1991 | 6016 | 3023 | 1902 | 1488 | 1500 | 1300 | 969 | 2981 |
| 1992 | 11863 | 5047 | 2334 | 1381 | 1020 | 1038 | 859 | 2671 |
| 1993 | 12548 | 10286 | 3868 | 1623 | 926 | 690 | 690 | 2314 |
| 1994 | 11403 | 10699 | 8094 | 2556 | 1076 | 639 | 462 | 1992 |
| 1995 | 10007 | 9698 | 8435 | 5626 | 1723 | 760 | 453 | 1680 |
| 1996 | 6753 | 8611 | 7625 | 5866 | 3770 | 1196 | 528 | 1453 |
| 1997 | 4595 | 5801 | 7027 | 5517 | 4009 | 2583 | 819 | 1340 |
| 1998 | 3813 | 3872 | 4552 | 4880 | 3649 | 2591 | 1644 | 1406 |
| 1999 | 5675 | 3165 | 3043 | 3307 | 3133 | 2195 | 1425 | 1650 |
| 2000 | 8158 | 4838 | 2475 | 2200 | 2186 | 1875 | 1264 | 1771 |
| 2001 | 8321 | 7047 | 3945 | 1893 | 1631 | 1548 | 1251 | 2194 |
| 2002 | 9126 | 7133 | 5655 | 2861 | 1373 | 1143 | 1020 | 2339 |
| 2003 | 8480 | 7909 | 5765 | 3947 | 1878 | 896 | 720 | 2195 |
| 2004 | 8732 | 7069 | 6196 | 3992 | 2419 | 1144 | 524 | 1747 |
| 2005 | 11399 | 7251 | 5299 | 4065 | 2440 | 1400 | 690 | 1389 |
| 2006 | 12803 | 9469 | 5493 | 3652 | 2631 | 1556 | 873 | 1398 |
| 2007 | 12464 | 10960 | 7307 | 3931 | 2443 | 1685 | 957 | 1368 |
| 2008 | 11900 | 10900 | 8927 | 5296 | 2842 | 1684 | 1126 | 1553 |
| 2009 | 10831 | 10166 | 9033 | 6568 | 3657 | 1954 | 1014 | 1576 |
| 2010 | 10782 | 9241 | 8594 | 7024 | 4784 | 2564 | 1171 | 1479 |
| 2011 | 10565 | 9184 | 7518 | 6534 | 5167 | 3373 | 1598 | 1613 |
| 2012 | 10997 | 9248 | 7741 | 5910 | 4991 | 3728 | 2178 | 1890 |
| 2013 | 9140 | 9627 | 7894 | 5940 | 4443 | 3524 | 2275 | 2321 |
| 2014 | 10257 | 7822 | 7845 | 6156 | 4212 | 2968 | 2001 | 2311 |
| 2015 | 11704 | 8682 | 6419 | 5887 | 4580 | 2860 | 1852 | 2486 |
| 2016 | 10867 | 10108 | 7118 | 4866 | 4096 | 3056 | 1712 | 2390 |
| 2017 | 13436 | 9265 | 8104 | 5262 | 3428 | 2615 | 1778 | 2087 |
| 2018 | 11927 | 11601 | 7303 | 5766 | 3608 | 2390 | 1556 | 2021 |
| 2019 | 15443 | 10008 | 8971 | 5402 | 3908 | 2289 | 1375 | 1642 |
| 2020 | 16150 | 13152 | 7770 | 6256 | 3854 | 2615 | 1323 | 1491 |
| 2021 | 15149 | 13659 | 10167 | 5813 | 4306 | 2705 | 1720 | 1664 |
| 2022 | 15510 | 12744 | 10645 | 7198 | 4094 | 2774 | 1617 | 1859 |
| 2023 | 16877 | 13035 | 9598 | 7525 | 4785 | 2716 | 1644 | 2041 |
| 2024 | 16422 | 14456 | 10057 | 6941 | 5196 | 3198 | 1776 | 2387 |