| Table 3. Estimated stock numbers at age. | ||||||
| Year Age | 0 | 1 | 2 | 3 | 4 | 5 | 
| 1985 | 167360 | 32325 | 19784 | 20919 | 4225 | 1499 | 
| 1986 | 59991 | 77334 | 18709 | 7799 | 4422 | 1118 | 
| 1987 | 32256 | 26659 | 51279 | 7394 | 1755 | 1135 | 
| 1988 | 29747 | 14282 | 17748 | 20654 | 1773 | 648 | 
| 1989 | 42583 | 13207 | 8306 | 7750 | 4948 | 560 | 
| 1990 | 81523 | 18982 | 8986 | 3681 | 2116 | 1356 | 
| 1991 | 169884 | 36546 | 13243 | 3979 | 945 | 833 | 
| 1992 | 52578 | 80409 | 24684 | 5607 | 988 | 412 | 
| 1993 | 119689 | 22374 | 54175 | 11134 | 1390 | 327 | 
| 1994 | 187608 | 54330 | 15533 | 26748 | 3447 | 403 | 
| 1995 | 91682 | 87020 | 41387 | 7410 | 8616 | 1199 | 
| 1996 | 206077 | 39516 | 72591 | 21235 | 1868 | 2620 | 
| 1997 | 286613 | 93817 | 18051 | 37352 | 4713 | 987 | 
| 1998 | 91375 | 134062 | 59453 | 7291 | 8621 | 1201 | 
| 1999 | 88041 | 39838 | 88746 | 25543 | 1683 | 2035 | 
| 2000 | 51904 | 40665 | 26620 | 37027 | 5374 | 708 | 
| 2001 | 89191 | 24173 | 29382 | 10651 | 7628 | 1150 | 
| 2002 | 31282 | 41688 | 17556 | 12924 | 2029 | 1588 | 
| 2003 | 124148 | 14576 | 34398 | 7740 | 2731 | 690 | 
| 2004 | 45872 | 60703 | 10650 | 17492 | 1956 | 755 | 
| 2005 | 45196 | 20571 | 49658 | 5108 | 4853 | 676 | 
| 2006 | 17029 | 21713 | 14607 | 26585 | 1510 | 1419 | 
| 2007 | 6946 | 7664 | 15131 | 7761 | 8472 | 874 | 
| 2008 | 57253 | 3087 | 5957 | 7334 | 2529 | 2590 | 
| 2009 | 24358 | 25805 | 3181 | 3769 | 2332 | 1516 | 
| 2010 | 34540 | 10806 | 21450 | 2128 | 1325 | 1182 | 
| 2011 | 27831 | 14837 | 7781 | 12830 | 807 | 762 | 
| 2012 | 64387 | 12172 | 11058 | 4609 | 4509 | 523 | 
| 2013 | 35704 | 28670 | 8611 | 6287 | 1577 | 1446 | 
| 2014 | 22766 | 15511 | 20332 | 4590 | 2043 | 758 | 
| 2015 | 5785 | 9802 | 10344 | 10503 | 1450 | 734 | 
| 2016 | 73993 | 2388 | 6956 | 4816 | 3255 | 588 | 
| 2017 | 3666 | 33239 | 1654 | 3843 | 1529 | 981 | 
| 2018 | 9193 | 1568 | 22841 | 860 | 1384 | 721 | 
| 2019 | 22390 | 4051 | 978 | 13399 | 343 | 639 | 
| 2020 | 38637 | 9981 | 2780 | 543 | 5526 | 313 | 
| 2021 | 38637 | 18119 | 7339 | 1861 | 234 | 2298 |