| Table 3. Estimated stock numbers at age. | ||||||
| Year Age | 1 | 2 | 3 | 4 | 5 | 6 |
| 1963 | 450297 | 177840 | 19980 | 10184 | 8038 | 5065 |
| 1964 | 736359 | 126598 | 51602 | 11411 | 5143 | 6743 |
| 1965 | 982182 | 216659 | 40413 | 22761 | 6113 | 5228 |
| 1966 | 1195307 | 264421 | 67721 | 16205 | 9175 | 5811 |
| 1967 | 1004294 | 323861 | 72740 | 28248 | 7878 | 7621 |
| 1968 | 505438 | 277056 | 90032 | 28569 | 14119 | 6495 |
| 1969 | 441264 | 134051 | 72049 | 33768 | 11200 | 9390 |
| 1970 | 1478917 | 124315 | 38940 | 32052 | 15154 | 7854 |
| 1971 | 1937468 | 401599 | 33682 | 14915 | 15913 | 9845 |
| 1972 | 473724 | 502573 | 90955 | 12103 | 5931 | 11887 |
| 1973 | 698964 | 113458 | 106074 | 29891 | 4935 | 6530 |
| 1974 | 692355 | 170581 | 23632 | 36236 | 10828 | 5167 |
| 1975 | 1180033 | 164265 | 36847 | 9669 | 16265 | 6589 |
| 1976 | 805356 | 282864 | 34086 | 13660 | 3786 | 9092 |
| 1977 | 1982055 | 172016 | 51066 | 10716 | 5064 | 5583 |
| 1978 | 1199935 | 450431 | 30829 | 18686 | 5612 | 4110 |
| 1979 | 1488889 | 268552 | 81166 | 8850 | 7247 | 3153 |
| 1980 | 2395308 | 313464 | 59569 | 24509 | 3951 | 4198 |
| 1981 | 936542 | 501966 | 59555 | 17619 | 8659 | 3195 |
| 1982 | 1486065 | 191989 | 94408 | 17106 | 6570 | 4950 |
| 1983 | 834560 | 313227 | 34217 | 21420 | 5487 | 3919 |
| 1984 | 1530713 | 177873 | 52622 | 8154 | 6756 | 3379 |
| 1985 | 375265 | 330892 | 33572 | 14925 | 2817 | 3737 |
| 1986 | 1826478 | 85929 | 58159 | 10409 | 5615 | 2588 |
| 1987 | 702003 | 419518 | 16573 | 15445 | 3040 | 2929 |
| 1988 | 475251 | 161786 | 72480 | 5395 | 4919 | 2009 |
| 1989 | 848856 | 108774 | 31183 | 17037 | 1848 | 2538 |
| 1990 | 336146 | 192912 | 20417 | 7831 | 4961 | 1389 |
| 1991 | 393957 | 80888 | 31145 | 5945 | 2622 | 2531 |
| 1992 | 972418 | 97239 | 15910 | 8730 | 2004 | 1720 |
| 1993 | 462924 | 227375 | 19179 | 5286 | 2856 | 1348 |
| 1994 | 1150464 | 119111 | 39724 | 5886 | 1807 | 1506 |
| 1995 | 706558 | 280651 | 26464 | 11009 | 1924 | 1143 |
| 1996 | 451994 | 169863 | 44166 | 6281 | 3574 | 1242 |
| 1997 | 1402774 | 120683 | 29626 | 10335 | 2025 | 1478 |
| 1998 | 137199 | 364351 | 23584 | 7447 | 3155 | 1031 |
| 1999 | 319784 | 37566 | 59983 | 5782 | 2112 | 1310 |
| 2000 | 477689 | 83620 | 9202 | 10389 | 1525 | 855 |
| 2001 | 203323 | 138311 | 15785 | 2375 | 2308 | 594 |
| 2002 | 293595 | 56299 | 28348 | 4334 | 648 | 815 |
| 2003 | 131206 | 75673 | 11756 | 7634 | 1142 | 422 |
| 2004 | 241448 | 38830 | 15066 | 3102 | 2010 | 458 |
| 2005 | 186020 | 61090 | 8518 | 3448 | 990 | 845 |
| 2006 | 422797 | 51311 | 13371 | 2178 | 1073 | 722 |
| 2007 | 191839 | 113185 | 10838 | 4162 | 956 | 628 |
| 2008 | 214679 | 49445 | 25561 | 3205 | 1582 | 777 |
| 2009 | 237506 | 57230 | 12059 | 7949 | 1387 | 906 |
| 2010 | 306583 | 67273 | 14308 | 4098 | 3269 | 887 |
| 2011 | 146937 | 90131 | 16833 | 4908 | 1877 | 2049 |
| 2012 | 222908 | 43329 | 25118 | 6953 | 2069 | 1739 |
| 2013 | 252739 | 61429 | 13774 | 10145 | 3161 | 1652 |
| 2014 | 325611 | 75106 | 19351 | 5851 | 4507 | 2031 |
| 2015 | 149640 | 101961 | 24185 | 7321 | 2481 | 3355 |
| 2016 | 107064 | 43841 | 30416 | 11289 | 3319 | 2337 |
| 2017 | 326120 | 31483 | 14253 | 11865 | 5255 | 2427 |
| 2018 | 66476 | 83199 | 10508 | 5699 | 4495 | 3667 |
| 2019 | 130506 | 18892 | 19134 | 2990 | 2286 | 3161 |
| 2020 | 292203 | 38478 | 5353 | 6306 | 1119 | 2242 |