| Table 3. Estimated stock numbers at age. | |||||||
| Year Age | 0 | 1 | 2 | 3 | 4 | 5 | 6 |
| 1980 | 1825784 | 437207 | 144547 | 24669 | 8361 | 992 | 2765 |
| 1981 | 1733979 | 200784 | 131706 | 46533 | 7099 | 2410 | 1280 |
| 1982 | 1768121 | 187418 | 60234 | 41891 | 13135 | 2008 | 1127 |
| 1983 | 1940745 | 191826 | 55413 | 18996 | 11595 | 3633 | 943 |
| 1984 | 1959516 | 213608 | 56022 | 16838 | 5061 | 3083 | 1274 |
| 1985 | 1910308 | 213823 | 61056 | 16432 | 4217 | 1278 | 1194 |
| 1986 | 1855762 | 208098 | 59851 | 17510 | 3999 | 1027 | 701 |
| 1987 | 1686880 | 203125 | 57757 | 16872 | 4188 | 954 | 469 |
| 1988 | 1590917 | 182187 | 55777 | 16082 | 3967 | 982 | 371 |
| 1989 | 1479409 | 173743 | 49027 | 15212 | 3673 | 895 | 331 |
| 1990 | 1379137 | 160254 | 45844 | 12675 | 3225 | 762 | 278 |
| 1991 | 1238544 | 151182 | 41314 | 11761 | 2620 | 649 | 227 |
| 1992 | 995394 | 136074 | 38907 | 10334 | 2413 | 514 | 185 |
| 1993 | 927166 | 107399 | 34509 | 10010 | 2138 | 463 | 150 |
| 1994 | 838757 | 101641 | 27935 | 8556 | 2190 | 434 | 135 |
| 1995 | 806596 | 89908 | 25474 | 7212 | 1714 | 398 | 112 |
| 1996 | 751234 | 87510 | 21493 | 6094 | 1454 | 300 | 98 |
| 1997 | 651951 | 80691 | 19262 | 4811 | 1076 | 225 | 65 |
| 1998 | 629658 | 68782 | 17043 | 4067 | 877 | 179 | 48 |
| 1999 | 562066 | 67761 | 12945 | 3152 | 643 | 134 | 36 |
| 2000 | 478791 | 59594 | 12257 | 2272 | 474 | 88 | 27 |
| 2001 | 447150 | 50711 | 9518 | 1945 | 360 | 67 | 19 |
| 2002 | 376189 | 46927 | 7821 | 1414 | 271 | 51 | 14 |
| 2003 | 350139 | 39315 | 6444 | 1105 | 191 | 33 | 10 |
| 2004 | 317547 | 36423 | 5188 | 842 | 152 | 25 | 7 |
| 2005 | 293670 | 32604 | 3896 | 596 | 99 | 17 | 5 |
| 2006 | 297616 | 30256 | 3112 | 407 | 64 | 10 | 3 |
| 2007 | 289024 | 30520 | 2578 | 294 | 43 | 6 | 2 |
| 2008 | 275922 | 29946 | 2615 | 265 | 35 | 5 | 2 |
| 2009 | 259316 | 28403 | 2728 | 276 | 36 | 5 | 2 |
| 2010 | 265028 | 26378 | 2670 | 315 | 44 | 7 | 2 |
| 2011 | 275820 | 27295 | 2594 | 344 | 55 | 9 | 3 |
| 2012 | 261882 | 28589 | 2937 | 356 | 62 | 11 | 3 |
| 2013 | 293178 | 26742 | 3059 | 414 | 67 | 12 | 4 |
| 2014 | 287634 | 30764 | 3113 | 444 | 81 | 15 | 5 |
| 2015 | 277225 | 29887 | 3882 | 487 | 88 | 17 | 6 |
| 2016 | 294586 | 28879 | 4157 | 645 | 111 | 19 | 7 |
| 2017 | 321278 | 31445 | 4679 | 750 | 137 | 25 | 8 |
| 2018 | 364226 | 34004 | 5643 | 880 | 159 | 30 | 9 |
| 2019 | 382765 | 38854 | 5919 | 1026 | 168 | 30 | 9 |
| 2020 | 374899 | 40665 | 6507 | 939 | 169 | 27 | 8 |
| 2021 | 376799 | 39624 | 6632 | 1009 | 149 | 26 | 7 |
| 2022 | 336621 | 40605 | 6331 | 903 | 152 | 22 | 7 |
| 2023 | 336413 | 35695 | 7308 | 1013 | 148 | 26 | 6 |