| Table 3. Estimated stock numbers at age. | ||||||||
| Year Age | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 |
| 1986 | 4693 | 4032 | 3396 | 3076 | 2300 | 1610 | 1811 | 2240 |
| 1987 | 4093 | 3996 | 3281 | 2650 | 2291 | 1680 | 1165 | 2961 |
| 1988 | 3027 | 3490 | 3277 | 2614 | 2064 | 1767 | 1282 | 3149 |
| 1989 | 2887 | 2575 | 2825 | 2564 | 2009 | 1582 | 1342 | 3362 |
| 1990 | 3527 | 2441 | 2016 | 2087 | 1829 | 1411 | 1084 | 3246 |
| 1991 | 5769 | 2985 | 1914 | 1484 | 1486 | 1292 | 969 | 2977 |
| 1992 | 12016 | 4883 | 2332 | 1384 | 1030 | 1027 | 862 | 2636 |
| 1993 | 12446 | 10159 | 3768 | 1624 | 930 | 702 | 680 | 2299 |
| 1994 | 11376 | 10525 | 7796 | 2547 | 1077 | 638 | 472 | 1979 |
| 1995 | 9940 | 9652 | 8202 | 5386 | 1734 | 759 | 445 | 1688 |
| 1996 | 6772 | 8447 | 7564 | 5682 | 3621 | 1202 | 521 | 1444 |
| 1997 | 4482 | 5771 | 6731 | 5416 | 3885 | 2492 | 816 | 1316 |
| 1998 | 3616 | 3813 | 4533 | 4664 | 3529 | 2503 | 1571 | 1342 |
| 1999 | 5393 | 3079 | 3011 | 3173 | 2953 | 2079 | 1359 | 1559 |
| 2000 | 7592 | 4597 | 2449 | 2145 | 2048 | 1771 | 1167 | 1678 |
| 2001 | 8112 | 6495 | 3761 | 1877 | 1573 | 1452 | 1213 | 2008 |
| 2002 | 8531 | 6929 | 5237 | 2780 | 1327 | 1079 | 955 | 2199 |
| 2003 | 7718 | 7273 | 5492 | 3675 | 1824 | 849 | 664 | 2043 |
| 2004 | 8275 | 6565 | 5678 | 3736 | 2282 | 1092 | 487 | 1639 |
| 2005 | 10529 | 7023 | 5040 | 3757 | 2267 | 1340 | 632 | 1302 |
| 2006 | 13105 | 8957 | 5507 | 3543 | 2475 | 1447 | 835 | 1253 |
| 2007 | 13795 | 11163 | 7096 | 3970 | 2404 | 1600 | 881 | 1283 |
| 2008 | 13252 | 11776 | 8986 | 5287 | 2850 | 1669 | 1057 | 1439 |
| 2009 | 11966 | 11315 | 9495 | 6685 | 3740 | 1908 | 1007 | 1466 |
| 2010 | 11914 | 10232 | 9228 | 7268 | 4881 | 2591 | 1174 | 1427 |
| 2011 | 12150 | 10185 | 8330 | 7046 | 5310 | 3408 | 1639 | 1563 |
| 2012 | 11391 | 10402 | 8385 | 6513 | 5272 | 3780 | 2187 | 1902 |
| 2013 | 9941 | 9747 | 8521 | 6467 | 4783 | 3650 | 2312 | 2294 |
| 2014 | 10411 | 8497 | 7906 | 6394 | 4562 | 3136 | 2066 | 2315 |
| 2015 | 11591 | 8908 | 6947 | 6016 | 4612 | 3116 | 1936 | 2476 |
| 2016 | 11190 | 9909 | 7223 | 5178 | 4196 | 3047 | 1855 | 2367 |
| 2017 | 12925 | 9557 | 7972 | 5302 | 3606 | 2751 | 1768 | 2132 |
| 2018 | 12064 | 11024 | 7619 | 5794 | 3721 | 2440 | 1641 | 2018 |
| 2019 | 14937 | 10280 | 8722 | 5517 | 4013 | 2445 | 1380 | 1706 |
| 2020 | 16113 | 12719 | 8105 | 6324 | 3888 | 2703 | 1451 | 1590 |
| 2021 | 15447 | 13725 | 10066 | 5995 | 4573 | 2741 | 1769 | 1872 |
| 2022 | 15739 | 13130 | 10677 | 7211 | 4158 | 3040 | 1681 | 2121 |
| 2023 | 16457 | 13362 | 10120 | 7538 | 4899 | 2741 | 1898 | 2334 |
| 2024 | 16419 | 13991 | 10402 | 7307 | 5259 | 3347 | 1818 | 2822 |