| Table 3. Estimated stock numbers at age. | ||||||||
| Year Age | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 |
| 1986 | 4705 | 4041 | 3399 | 3076 | 2303 | 1611 | 1810 | 2240 |
| 1987 | 4100 | 4007 | 3288 | 2652 | 2290 | 1680 | 1165 | 2959 |
| 1988 | 3007 | 3497 | 3287 | 2621 | 2067 | 1768 | 1283 | 3150 |
| 1989 | 2867 | 2559 | 2831 | 2573 | 2016 | 1586 | 1343 | 3366 |
| 1990 | 3501 | 2424 | 2003 | 2091 | 1834 | 1415 | 1085 | 3245 |
| 1991 | 5743 | 2963 | 1901 | 1475 | 1489 | 1297 | 972 | 2978 |
| 1992 | 12185 | 4861 | 2315 | 1375 | 1023 | 1029 | 865 | 2638 |
| 1993 | 12501 | 10301 | 3750 | 1612 | 924 | 698 | 681 | 2301 |
| 1994 | 11391 | 10569 | 7896 | 2530 | 1068 | 633 | 469 | 1981 |
| 1995 | 9965 | 9664 | 8231 | 5449 | 1722 | 752 | 442 | 1686 |
| 1996 | 6780 | 8467 | 7570 | 5696 | 3660 | 1193 | 517 | 1439 |
| 1997 | 4447 | 5778 | 6748 | 5420 | 3895 | 2520 | 810 | 1308 |
| 1998 | 3580 | 3783 | 4538 | 4672 | 3530 | 2510 | 1590 | 1333 |
| 1999 | 5409 | 3048 | 2987 | 3176 | 2955 | 2077 | 1360 | 1557 |
| 2000 | 7658 | 4611 | 2424 | 2127 | 2046 | 1768 | 1162 | 1672 |
| 2001 | 8165 | 6552 | 3774 | 1860 | 1560 | 1451 | 1212 | 2004 |
| 2002 | 8588 | 6974 | 5284 | 2789 | 1314 | 1070 | 954 | 2196 |
| 2003 | 7541 | 7321 | 5528 | 3703 | 1828 | 840 | 658 | 2039 |
| 2004 | 8041 | 6415 | 5718 | 3758 | 2296 | 1093 | 481 | 1629 |
| 2005 | 10611 | 6825 | 4931 | 3785 | 2278 | 1346 | 632 | 1290 |
| 2006 | 13771 | 9029 | 5360 | 3476 | 2499 | 1456 | 840 | 1246 |
| 2007 | 14513 | 11731 | 7154 | 3868 | 2362 | 1616 | 887 | 1280 |
| 2008 | 13571 | 12388 | 9438 | 5328 | 2778 | 1641 | 1071 | 1444 |
| 2009 | 12010 | 11587 | 9981 | 7019 | 3771 | 1858 | 992 | 1476 |
| 2010 | 11915 | 10270 | 9454 | 7653 | 5137 | 2614 | 1146 | 1422 |
| 2011 | 12318 | 10188 | 8366 | 7226 | 5603 | 3592 | 1660 | 1543 |
| 2012 | 12025 | 10549 | 8395 | 6550 | 5420 | 4000 | 2316 | 1906 |
| 2013 | 9316 | 10292 | 8651 | 6481 | 4819 | 3760 | 2457 | 2382 |
| 2014 | 9559 | 7966 | 8363 | 6497 | 4578 | 3161 | 2133 | 2448 |
| 2015 | 11620 | 8182 | 6530 | 6384 | 4703 | 3137 | 1961 | 2620 |
| 2016 | 11207 | 9937 | 6649 | 4865 | 4454 | 3107 | 1871 | 2480 |
| 2017 | 13919 | 9574 | 8007 | 4856 | 3366 | 2903 | 1790 | 2198 |
| 2018 | 13498 | 11881 | 7668 | 5821 | 3395 | 2268 | 1721 | 2064 |
| 2019 | 19401 | 11517 | 9483 | 5598 | 4045 | 2230 | 1269 | 1749 |
| 2020 | 23577 | 16553 | 9203 | 6986 | 3986 | 2740 | 1318 | 1529 |
| 2021 | 25843 | 20136 | 13339 | 6970 | 5147 | 2848 | 1805 | 1738 |
| 2022 | 30021 | 22057 | 16136 | 9988 | 5029 | 3540 | 1794 | 2070 |
| 2023 | 37440 | 25634 | 17740 | 12188 | 7258 | 3519 | 2326 | 2423 |
| 2024 | 37172 | 32031 | 20937 | 13849 | 9243 | 5365 | 2501 | 3293 |