| Table 3. Estimated stock numbers at age. | ||||||
| Year Age | 1 | 2 | 3 | 4 | 5 | 6 |
| 1963 | 400781 | 166624 | 20115 | 10066 | 7910 | 4516 |
| 1964 | 662367 | 121133 | 51239 | 11290 | 5087 | 6194 |
| 1965 | 864138 | 207978 | 39970 | 22565 | 6036 | 4920 |
| 1966 | 1057956 | 250727 | 67111 | 16275 | 9305 | 5417 |
| 1967 | 894938 | 308320 | 72328 | 28419 | 7850 | 7288 |
| 1968 | 452655 | 264299 | 89415 | 28382 | 13985 | 6343 |
| 1969 | 400446 | 128867 | 72375 | 33734 | 11172 | 8957 |
| 1970 | 1314611 | 119905 | 38493 | 32005 | 15056 | 7606 |
| 1971 | 1719442 | 380029 | 33588 | 14882 | 15819 | 9678 |
| 1972 | 427846 | 473997 | 90796 | 12184 | 5983 | 11697 |
| 1973 | 635836 | 108932 | 105974 | 29806 | 4949 | 6496 |
| 1974 | 628520 | 163829 | 23843 | 36402 | 10911 | 4991 |
| 1975 | 1072355 | 157609 | 37050 | 9586 | 16194 | 6532 |
| 1976 | 733292 | 267858 | 34186 | 13587 | 3813 | 9121 |
| 1977 | 1805315 | 163099 | 51606 | 10943 | 5104 | 5511 |
| 1978 | 1146199 | 421799 | 31027 | 18710 | 5502 | 4182 |
| 1979 | 1393499 | 262001 | 80651 | 8986 | 7248 | 3191 |
| 1980 | 2240299 | 300618 | 59153 | 24543 | 3934 | 4248 |
| 1981 | 878728 | 478406 | 59370 | 17616 | 8803 | 3245 |
| 1982 | 1414194 | 182989 | 93247 | 17035 | 6584 | 5115 |
| 1983 | 800645 | 301279 | 33786 | 21487 | 5459 | 4107 |
| 1984 | 1432695 | 172620 | 52688 | 8153 | 6767 | 3488 |
| 1985 | 362980 | 317697 | 33606 | 14724 | 2789 | 3832 |
| 1986 | 1595159 | 84675 | 58224 | 10189 | 5506 | 2680 |
| 1987 | 617368 | 375827 | 16859 | 15566 | 3024 | 3035 |
| 1988 | 425533 | 150202 | 71817 | 5243 | 4983 | 2122 |
| 1989 | 719942 | 104983 | 30604 | 17317 | 1795 | 2662 |
| 1990 | 293702 | 174346 | 20508 | 7792 | 5075 | 1471 |
| 1991 | 335286 | 74058 | 30693 | 5936 | 2606 | 2622 |
| 1992 | 745048 | 88008 | 14999 | 8686 | 1972 | 1788 |
| 1993 | 386527 | 188674 | 17818 | 4770 | 2698 | 1337 |
| 1994 | 889685 | 104017 | 35006 | 5239 | 1600 | 1432 |
| 1995 | 521042 | 232559 | 22932 | 9600 | 1706 | 1082 |
| 1996 | 339752 | 135152 | 39391 | 5470 | 3102 | 1154 |
| 1997 | 997689 | 95874 | 26061 | 9222 | 1752 | 1406 |
| 1998 | 108125 | 275456 | 20338 | 6454 | 2766 | 991 |
| 1999 | 215980 | 31123 | 49434 | 4766 | 1773 | 1200 |
| 2000 | 396328 | 62025 | 7636 | 8960 | 1285 | 811 |
| 2001 | 148464 | 118086 | 13331 | 1987 | 2035 | 567 |
| 2002 | 220260 | 45863 | 24158 | 3528 | 537 | 741 |
| 2003 | 111815 | 63713 | 10300 | 6438 | 969 | 394 |
| 2004 | 189869 | 35572 | 13730 | 2769 | 1803 | 433 |
| 2005 | 153599 | 53532 | 7983 | 3247 | 895 | 804 |
| 2006 | 347079 | 47316 | 12735 | 2144 | 1023 | 693 |
| 2007 | 166088 | 100211 | 10327 | 3900 | 895 | 599 |
| 2008 | 183305 | 47240 | 23366 | 3040 | 1453 | 701 |
| 2009 | 176134 | 52079 | 11367 | 7031 | 1239 | 804 |
| 2010 | 260806 | 51661 | 12552 | 3582 | 2711 | 725 |
| 2011 | 128625 | 73764 | 12490 | 3774 | 1418 | 1388 |
| 2012 | 172877 | 38009 | 18782 | 5018 | 1551 | 1157 |
| 2013 | 219296 | 48514 | 10511 | 7474 | 2300 | 1107 |
| 2014 | 304787 | 61674 | 14459 | 4412 | 3384 | 1394 |
| 2015 | 151513 | 86766 | 18904 | 5669 | 1940 | 2351 |
| 2016 | 108354 | 40315 | 24643 | 8758 | 2642 | 1719 |
| 2017 | 370269 | 27737 | 12264 | 9991 | 4338 | 1929 |
| 2018 | 97507 | 94749 | 8232 | 5103 | 4312 | 3007 |