| Table 3. Estimated stock numbers at age. | ||||||||
| Year Age | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 |
| 1986 | 3609 | 2871 | 3170 | 3231 | 2428 | 1632 | 1842 | 2267 |
| 1987 | 4222 | 3501 | 2637 | 2400 | 2226 | 1670 | 1163 | 3014 |
| 1988 | 4005 | 3578 | 2944 | 2298 | 1931 | 1651 | 1203 | 3160 |
| 1989 | 3365 | 3079 | 2756 | 2323 | 1912 | 1630 | 1311 | 3195 |
| 1990 | 4804 | 2565 | 2169 | 2062 | 1720 | 1340 | 1137 | 3104 |
| 1991 | 6344 | 3381 | 1938 | 1544 | 1503 | 1275 | 932 | 2969 |
| 1992 | 17581 | 5299 | 2492 | 1431 | 1043 | 1047 | 830 | 2718 |
| 1993 | 11845 | 13995 | 4164 | 1722 | 951 | 702 | 701 | 2329 |
| 1994 | 12870 | 10928 | 10303 | 2705 | 1150 | 669 | 469 | 2027 |
| 1995 | 12026 | 11197 | 9140 | 6780 | 1824 | 817 | 492 | 1712 |
| 1996 | 3681 | 9801 | 8861 | 6605 | 4406 | 1297 | 587 | 1543 |
| 1997 | 5779 | 4700 | 8013 | 6290 | 4533 | 2929 | 913 | 1478 |
| 1998 | 4198 | 4315 | 4111 | 5493 | 4131 | 2937 | 1882 | 1690 |
| 1999 | 8076 | 3218 | 3331 | 3517 | 3791 | 2627 | 1706 | 2012 |
| 2000 | 17544 | 6554 | 2588 | 2522 | 2593 | 2326 | 1617 | 2161 |
| 2001 | 9304 | 13811 | 4907 | 2032 | 1912 | 1819 | 1464 | 2854 |
| 2002 | 8330 | 8463 | 8406 | 3208 | 1615 | 1414 | 1215 | 2898 |
| 2003 | 6576 | 7889 | 6680 | 5052 | 2058 | 1078 | 947 | 2703 |
| 2004 | 7585 | 5851 | 6430 | 4540 | 2811 | 1263 | 633 | 2084 |
| 2005 | 16962 | 6452 | 4838 | 4196 | 2733 | 1568 | 828 | 1626 |
| 2006 | 15707 | 11062 | 4990 | 3552 | 2725 | 1763 | 1036 | 1776 |
| 2007 | 7047 | 12460 | 7893 | 3686 | 2489 | 1791 | 1153 | 1598 |
| 2008 | 7757 | 6918 | 9669 | 5529 | 2641 | 1785 | 1266 | 1805 |
| 2009 | 11180 | 7583 | 6943 | 6726 | 3736 | 1936 | 1166 | 1770 |
| 2010 | 12187 | 9491 | 7446 | 6111 | 4783 | 2581 | 1159 | 1603 |
| 2011 | 8440 | 9350 | 7157 | 5923 | 4798 | 3317 | 1649 | 1723 |
| 2012 | 12983 | 7893 | 7239 | 5382 | 4502 | 3465 | 2074 | 1918 |
| 2013 | 7313 | 11571 | 7219 | 5447 | 4156 | 3265 | 2106 | 2325 |
| 2014 | 7928 | 6430 | 9539 | 6031 | 4088 | 2883 | 1877 | 2190 |
| 2015 | 12369 | 7547 | 5836 | 7492 | 4733 | 2887 | 1859 | 2446 |
| 2016 | 6572 | 10614 | 6929 | 4749 | 5117 | 3260 | 1806 | 2556 |
| 2017 | 29910 | 8319 | 10170 | 5880 | 3812 | 3467 | 2051 | 2391 |
| 2018 | 14072 | 23691 | 8305 | 7903 | 4533 | 2994 | 2192 | 2566 |
| 2019 | 29983 | 12550 | 15797 | 7066 | 5672 | 3111 | 1904 | 2428 |
| 2020 | 40976 | 24895 | 10514 | 10489 | 5540 | 4157 | 2008 | 2331 |
| 2021 | 26078 | 26566 | 16581 | 7871 | 6782 | 4047 | 2947 | 2744 |
| 2022 | 35652 | 20728 | 18274 | 11343 | 5705 | 4335 | 2604 | 3321 |
| 2023 | 41934 | 27417 | 15534 | 12627 | 7584 | 3915 | 2886 | 3834 |
| 2024 | 23332 | 35339 | 20590 | 11610 | 8662 | 5180 | 2769 | 4800 |