| Table 3. Estimated stock numbers at age. | ||||||
| Year Age | 1 | 2 | 3 | 4 | 5 | 6 |
| 1963 | 399031 | 168814 | 20027 | 10215 | 8102 | 4948 |
| 1964 | 652519 | 120437 | 51697 | 11465 | 5196 | 6750 |
| 1965 | 873880 | 206277 | 40401 | 22882 | 6173 | 5313 |
| 1966 | 1062823 | 252273 | 67716 | 16346 | 9341 | 5931 |
| 1967 | 892427 | 308624 | 72935 | 28529 | 7998 | 7926 |
| 1968 | 449049 | 263979 | 90201 | 28765 | 14290 | 6841 |
| 1969 | 392741 | 127562 | 72253 | 33997 | 11331 | 9733 |
| 1970 | 1321545 | 118634 | 38830 | 32172 | 15295 | 8135 |
| 1971 | 1737151 | 383635 | 33645 | 14947 | 16023 | 10326 |
| 1972 | 429251 | 479474 | 91033 | 12159 | 5976 | 12578 |
| 1973 | 634884 | 108964 | 106056 | 29980 | 4958 | 6944 |
| 1974 | 630409 | 163633 | 23680 | 36417 | 10946 | 5444 |
| 1975 | 1085216 | 157749 | 36895 | 9681 | 16393 | 6987 |
| 1976 | 749948 | 272390 | 34081 | 13684 | 3799 | 9655 |
| 1977 | 1830715 | 165726 | 51197 | 10812 | 5108 | 6003 |
| 1978 | 1120110 | 429781 | 30929 | 18827 | 5647 | 4512 |
| 1979 | 1397904 | 258482 | 80975 | 8915 | 7328 | 3425 |
| 1980 | 2255448 | 301530 | 59325 | 24577 | 3969 | 4570 |
| 1981 | 876785 | 482226 | 59297 | 17616 | 8768 | 3531 |
| 1982 | 1453741 | 182973 | 93743 | 17005 | 6579 | 5507 |
| 1983 | 805918 | 313121 | 33531 | 21232 | 5385 | 4395 |
| 1984 | 1493858 | 174671 | 52542 | 7967 | 6713 | 3750 |
| 1985 | 360296 | 332154 | 33320 | 14703 | 2752 | 4103 |
| 1986 | 1636035 | 84769 | 58677 | 10166 | 5598 | 2922 |
| 1987 | 620107 | 386973 | 16698 | 15427 | 2988 | 3293 |
| 1988 | 429007 | 151098 | 71784 | 5269 | 4918 | 2307 |
| 1989 | 751022 | 106364 | 30835 | 17399 | 1826 | 2897 |
| 1990 | 296737 | 182003 | 20575 | 7886 | 5105 | 1641 |
| 1991 | 342524 | 75047 | 31044 | 6025 | 2688 | 2930 |
| 1992 | 803535 | 90668 | 15206 | 8849 | 2031 | 2025 |
| 1993 | 399821 | 203361 | 18411 | 5049 | 2853 | 1569 |
| 1994 | 972986 | 107862 | 37310 | 5546 | 1733 | 1702 |
| 1995 | 556510 | 253919 | 24219 | 10422 | 1812 | 1307 |
| 1996 | 357640 | 142648 | 41579 | 5727 | 3377 | 1413 |
| 1997 | 1112212 | 101521 | 27191 | 9670 | 1871 | 1680 |
| 1998 | 113484 | 308831 | 22285 | 7142 | 3086 | 1246 |
| 1999 | 234346 | 33177 | 56518 | 5567 | 2083 | 1575 |
| 2000 | 430610 | 67533 | 8710 | 9964 | 1507 | 1067 |
| 2001 | 156925 | 128440 | 14580 | 2201 | 2285 | 739 |
| 2002 | 237650 | 49036 | 26314 | 3899 | 599 | 950 |
| 2003 | 116956 | 68325 | 11225 | 7278 | 1097 | 533 |
| 2004 | 198824 | 37812 | 14700 | 3077 | 2025 | 580 |
| 2005 | 155181 | 55018 | 8489 | 3422 | 1006 | 1056 |
| 2006 | 362676 | 48032 | 13166 | 2229 | 1109 | 931 |
| 2007 | 170097 | 104332 | 10591 | 4207 | 984 | 807 |
| 2008 | 192357 | 48134 | 24946 | 3228 | 1645 | 992 |
| 2009 | 185535 | 54698 | 11848 | 7694 | 1412 | 1141 |
| 2010 | 279508 | 55130 | 13601 | 3973 | 3233 | 1075 |
| 2011 | 135062 | 79307 | 13839 | 4298 | 1725 | 2141 |
| 2012 | 182101 | 40504 | 20713 | 5967 | 1927 | 1869 |
| 2013 | 230852 | 51163 | 11574 | 8754 | 2915 | 1813 |
| 2014 | 328013 | 65135 | 16001 | 5096 | 4224 | 2281 |
| 2015 | 161653 | 94818 | 21008 | 6584 | 2452 | 3918 |
| 2016 | 112179 | 43165 | 28019 | 10613 | 3415 | 2955 |
| 2017 | 391686 | 28541 | 13923 | 12476 | 5787 | 3375 |
| 2018 | 98396 | 99261 | 8603 | 6371 | 6660 | 5369 |