| Table 3. Estimated stock numbers at age. | ||||||||
| Year Age | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 |
| 1986 | 4668 | 3900 | 3290 | 3101 | 2326 | 1613 | 1812 | 2239 |
| 1987 | 4083 | 3994 | 3205 | 2575 | 2277 | 1680 | 1166 | 2970 |
| 1988 | 3118 | 3491 | 3278 | 2583 | 2035 | 1742 | 1266 | 3154 |
| 1989 | 2930 | 2627 | 2817 | 2550 | 2006 | 1599 | 1332 | 3325 |
| 1990 | 3598 | 2443 | 2031 | 2088 | 1822 | 1405 | 1104 | 3209 |
| 1991 | 5951 | 3001 | 1898 | 1482 | 1494 | 1295 | 966 | 2980 |
| 1992 | 11988 | 4993 | 2327 | 1377 | 1019 | 1034 | 858 | 2658 |
| 1993 | 12584 | 10284 | 3836 | 1619 | 924 | 691 | 686 | 2307 |
| 1994 | 11440 | 10678 | 8040 | 2556 | 1075 | 636 | 462 | 1986 |
| 1995 | 10060 | 9719 | 8397 | 5585 | 1727 | 758 | 449 | 1679 |
| 1996 | 6776 | 8621 | 7646 | 5839 | 3750 | 1198 | 525 | 1446 |
| 1997 | 4582 | 5813 | 6991 | 5524 | 3996 | 2575 | 818 | 1329 |
| 1998 | 3760 | 3876 | 4572 | 4857 | 3641 | 2582 | 1635 | 1384 |
| 1999 | 5629 | 3149 | 3055 | 3287 | 3108 | 2184 | 1420 | 1635 |
| 2000 | 8135 | 4801 | 2479 | 2202 | 2164 | 1868 | 1254 | 1768 |
| 2001 | 8372 | 6999 | 3917 | 1899 | 1630 | 1536 | 1259 | 2172 |
| 2002 | 9072 | 7173 | 5616 | 2858 | 1368 | 1137 | 1015 | 2340 |
| 2003 | 8250 | 7817 | 5764 | 3927 | 1881 | 890 | 715 | 2194 |
| 2004 | 8555 | 6925 | 6122 | 3975 | 2418 | 1143 | 520 | 1759 |
| 2005 | 11189 | 7149 | 5236 | 4031 | 2429 | 1408 | 683 | 1403 |
| 2006 | 13032 | 9361 | 5482 | 3633 | 2625 | 1553 | 881 | 1393 |
| 2007 | 12861 | 11127 | 7276 | 3932 | 2441 | 1688 | 957 | 1389 |
| 2008 | 12199 | 11146 | 9008 | 5311 | 2837 | 1688 | 1127 | 1571 |
| 2009 | 11094 | 10438 | 9157 | 6651 | 3692 | 1936 | 1020 | 1598 |
| 2010 | 11072 | 9466 | 8718 | 7096 | 4842 | 2573 | 1174 | 1510 |
| 2011 | 11043 | 9440 | 7690 | 6650 | 5214 | 3400 | 1613 | 1633 |
| 2012 | 11218 | 9586 | 7866 | 6027 | 5043 | 3745 | 2191 | 1923 |
| 2013 | 9150 | 9728 | 8052 | 6028 | 4488 | 3534 | 2286 | 2339 |
| 2014 | 9968 | 7819 | 7892 | 6197 | 4254 | 2974 | 2003 | 2331 |
| 2015 | 11506 | 8481 | 6416 | 5941 | 4568 | 2887 | 1846 | 2481 |
| 2016 | 10825 | 9896 | 6940 | 4831 | 4109 | 3035 | 1718 | 2355 |
| 2017 | 13566 | 9244 | 7951 | 5115 | 3384 | 2629 | 1756 | 2052 |
| 2018 | 12010 | 11642 | 7312 | 5688 | 3518 | 2328 | 1551 | 1960 |
| 2019 | 15918 | 10122 | 9085 | 5367 | 3873 | 2246 | 1322 | 1586 |
| 2020 | 16381 | 13566 | 7925 | 6430 | 3827 | 2589 | 1297 | 1416 |
| 2021 | 16479 | 13848 | 10639 | 5915 | 4524 | 2701 | 1688 | 1583 |
| 2022 | 16217 | 13983 | 10833 | 7656 | 4171 | 2995 | 1635 | 1773 |