| Table 3. Estimated stock numbers at age. | ||||||
| Year Age | 1 | 2 | 3 | 4 | 5 | 6 |
| 1963 | 397633 | 168500 | 20027 | 10207 | 8073 | 4802 |
| 1964 | 650569 | 120027 | 51684 | 11452 | 5174 | 6562 |
| 1965 | 871808 | 205880 | 40329 | 22796 | 6141 | 5135 |
| 1966 | 1059734 | 251542 | 67632 | 16262 | 9263 | 5758 |
| 1967 | 891641 | 307703 | 72743 | 28356 | 7945 | 7692 |
| 1968 | 448190 | 263919 | 89984 | 28620 | 14170 | 6600 |
| 1969 | 391338 | 127254 | 72243 | 33908 | 11252 | 9461 |
| 1970 | 1319269 | 118351 | 38922 | 32160 | 15245 | 7893 |
| 1971 | 1740206 | 383565 | 33619 | 14922 | 15986 | 10047 |
| 1972 | 431806 | 480379 | 90846 | 12112 | 5943 | 12284 |
| 1973 | 635677 | 109265 | 105932 | 29924 | 4942 | 6737 |
| 1974 | 632510 | 163420 | 23682 | 36392 | 10907 | 5308 |
| 1975 | 1092931 | 157950 | 36877 | 9703 | 16364 | 6813 |
| 1976 | 755228 | 273636 | 34058 | 13706 | 3792 | 9427 |
| 1977 | 1842843 | 165591 | 51137 | 10796 | 5105 | 5850 |
| 1978 | 1122754 | 431552 | 30856 | 18832 | 5645 | 4376 |
| 1979 | 1399884 | 257472 | 81062 | 8908 | 7322 | 3323 |
| 1980 | 2254006 | 301026 | 59388 | 24600 | 3977 | 4456 |
| 1981 | 877285 | 479905 | 59298 | 17631 | 8758 | 3437 |
| 1982 | 1414554 | 182564 | 93801 | 17003 | 6577 | 5372 |
| 1983 | 784294 | 303281 | 33560 | 21226 | 5393 | 4267 |
| 1984 | 1436937 | 169812 | 52359 | 7972 | 6738 | 3647 |
| 1985 | 350975 | 319790 | 33201 | 14729 | 2769 | 3999 |
| 1986 | 1597931 | 82321 | 58294 | 10148 | 5610 | 2832 |
| 1987 | 609972 | 378414 | 16635 | 15428 | 2993 | 3199 |
| 1988 | 421805 | 148872 | 71614 | 5287 | 4924 | 2227 |
| 1989 | 733346 | 104715 | 30675 | 17280 | 1832 | 2809 |
| 1990 | 294268 | 177470 | 20497 | 7863 | 5070 | 1575 |
| 1991 | 341888 | 74326 | 30801 | 5996 | 2678 | 2832 |
| 1992 | 780266 | 90491 | 15127 | 8808 | 2023 | 1938 |
| 1993 | 395474 | 197952 | 18177 | 4990 | 2813 | 1490 |
| 1994 | 951238 | 106664 | 36679 | 5450 | 1700 | 1616 |
| 1995 | 544657 | 249635 | 23908 | 10295 | 1788 | 1237 |
| 1996 | 350372 | 140455 | 41050 | 5647 | 3338 | 1346 |
| 1997 | 1072352 | 99580 | 26812 | 9541 | 1850 | 1595 |
| 1998 | 112966 | 300503 | 21867 | 6992 | 3024 | 1169 |
| 1999 | 227641 | 33139 | 55151 | 5441 | 2024 | 1481 |
| 2000 | 416935 | 65680 | 8562 | 9627 | 1454 | 988 |
| 2001 | 152852 | 124645 | 14148 | 2137 | 2200 | 679 |
| 2002 | 229713 | 47721 | 25583 | 3785 | 579 | 881 |
| 2003 | 113961 | 66135 | 10897 | 7067 | 1052 | 489 |
| 2004 | 193972 | 36817 | 14277 | 2996 | 1953 | 535 |
| 2005 | 154826 | 54133 | 8338 | 3335 | 984 | 987 |
| 2006 | 354524 | 48027 | 13039 | 2195 | 1089 | 875 |
| 2007 | 168447 | 102833 | 10473 | 4162 | 967 | 753 |
| 2008 | 190527 | 47731 | 24650 | 3157 | 1601 | 926 |
| 2009 | 183333 | 54029 | 11654 | 7539 | 1369 | 1055 |
| 2010 | 270365 | 54469 | 13336 | 3868 | 3132 | 987 |
| 2011 | 131827 | 77152 | 13625 | 4180 | 1666 | 1986 |
| 2012 | 179746 | 39548 | 20171 | 5803 | 1854 | 1723 |
| 2013 | 223389 | 50546 | 11239 | 8425 | 2789 | 1664 |
| 2014 | 310228 | 62944 | 15496 | 4872 | 4013 | 2078 |
| 2015 | 150660 | 89029 | 19763 | 6137 | 2294 | 3528 |
| 2016 | 114185 | 39649 | 25180 | 9525 | 3077 | 2560 |
| 2017 | 320063 | 29346 | 11740 | 10117 | 4923 | 2766 |
| 2018 | 77677 | 78025 | 8984 | 4608 | 4236 | 4432 |
| 2019 | 133583 | 19220 | 19728 | 2670 | 1654 | 4416 |