| Table 3. Estimated stock numbers at age. | ||||||||
| Year Age | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 |
| 1986 | 4704 | 4039 | 3396 | 3077 | 2304 | 1611 | 1810 | 2240 |
| 1987 | 4097 | 4007 | 3287 | 2650 | 2290 | 1681 | 1166 | 2959 |
| 1988 | 3008 | 3495 | 3287 | 2620 | 2066 | 1767 | 1283 | 3150 |
| 1989 | 2867 | 2559 | 2830 | 2573 | 2015 | 1585 | 1343 | 3365 |
| 1990 | 3502 | 2424 | 2004 | 2090 | 1834 | 1415 | 1085 | 3245 |
| 1991 | 5745 | 2964 | 1901 | 1475 | 1489 | 1297 | 972 | 2978 |
| 1992 | 12168 | 4863 | 2315 | 1375 | 1023 | 1029 | 865 | 2639 |
| 1993 | 12496 | 10291 | 3751 | 1612 | 924 | 698 | 681 | 2302 |
| 1994 | 11388 | 10567 | 7890 | 2531 | 1068 | 633 | 469 | 1981 |
| 1995 | 9965 | 9661 | 8230 | 5447 | 1722 | 752 | 442 | 1686 |
| 1996 | 6778 | 8468 | 7567 | 5697 | 3659 | 1193 | 516 | 1438 |
| 1997 | 4450 | 5777 | 6749 | 5419 | 3895 | 2519 | 810 | 1308 |
| 1998 | 3584 | 3785 | 4536 | 4673 | 3530 | 2510 | 1589 | 1333 |
| 1999 | 5409 | 3051 | 2988 | 3175 | 2956 | 2077 | 1360 | 1558 |
| 2000 | 7660 | 4610 | 2425 | 2127 | 2046 | 1768 | 1163 | 1673 |
| 2001 | 8165 | 6554 | 3773 | 1860 | 1561 | 1451 | 1212 | 2005 |
| 2002 | 8587 | 6974 | 5285 | 2788 | 1315 | 1070 | 954 | 2196 |
| 2003 | 7535 | 7320 | 5527 | 3703 | 1827 | 840 | 658 | 2039 |
| 2004 | 8045 | 6410 | 5717 | 3757 | 2296 | 1093 | 481 | 1628 |
| 2005 | 10612 | 6828 | 4927 | 3785 | 2279 | 1346 | 632 | 1289 |
| 2006 | 13747 | 9029 | 5363 | 3473 | 2499 | 1456 | 840 | 1245 |
| 2007 | 14498 | 11711 | 7155 | 3870 | 2360 | 1616 | 888 | 1279 |
| 2008 | 13545 | 12377 | 9423 | 5328 | 2780 | 1640 | 1070 | 1443 |
| 2009 | 11999 | 11565 | 9975 | 7006 | 3770 | 1860 | 991 | 1475 |
| 2010 | 11917 | 10260 | 9440 | 7647 | 5126 | 2613 | 1148 | 1421 |
| 2011 | 12305 | 10189 | 8357 | 7215 | 5599 | 3585 | 1659 | 1543 |
| 2012 | 11988 | 10537 | 8395 | 6541 | 5412 | 3996 | 2311 | 1905 |
| 2013 | 9292 | 10260 | 8643 | 6478 | 4813 | 3754 | 2455 | 2379 |
| 2014 | 9516 | 7944 | 8335 | 6491 | 4575 | 3157 | 2129 | 2445 |
| 2015 | 11513 | 8145 | 6511 | 6359 | 4698 | 3134 | 1958 | 2614 |
| 2016 | 11043 | 9846 | 6615 | 4849 | 4434 | 3104 | 1868 | 2473 |
| 2017 | 13564 | 9434 | 7929 | 4827 | 3353 | 2886 | 1786 | 2191 |
| 2018 | 13512 | 11577 | 7550 | 5754 | 3369 | 2257 | 1708 | 2055 |
| 2019 | 18844 | 11525 | 9223 | 5499 | 3985 | 2207 | 1258 | 1733 |
| 2020 | 22877 | 16075 | 9194 | 6768 | 3902 | 2690 | 1297 | 1505 |
| 2021 | 24062 | 19532 | 12931 | 6948 | 4967 | 2779 | 1762 | 1699 |
| 2022 | 28213 | 20528 | 15615 | 9641 | 4993 | 3396 | 1733 | 1998 |
| 2023 | 35463 | 24080 | 16454 | 11731 | 6963 | 3477 | 2205 | 2310 |
| 2024 | 35253 | 30329 | 19599 | 12766 | 8835 | 5117 | 2450 | 3098 |