| Table 3. Estimated stock numbers at age. | ||||||
| Year Age | 1 | 2 | 3 | 4 | 5 | 6 | 
| 1963 | 444675 | 181612 | 20435 | 10461 | 8403 | 5446 | 
| 1964 | 723065 | 125243 | 52526 | 11659 | 5338 | 7315 | 
| 1965 | 988149 | 214971 | 40468 | 23070 | 6268 | 5716 | 
| 1966 | 1192096 | 265770 | 67974 | 16459 | 9492 | 6362 | 
| 1967 | 1012314 | 323013 | 73198 | 28637 | 8071 | 8390 | 
| 1968 | 496752 | 281280 | 90327 | 28826 | 14381 | 7207 | 
| 1969 | 429906 | 131706 | 73421 | 34445 | 11550 | 10341 | 
| 1970 | 1476998 | 122636 | 39118 | 32617 | 15600 | 8694 | 
| 1971 | 1963504 | 404611 | 33503 | 14921 | 16068 | 10809 | 
| 1972 | 485338 | 509830 | 90454 | 12028 | 5908 | 12920 | 
| 1973 | 704239 | 115094 | 106075 | 29846 | 4931 | 7210 | 
| 1974 | 696505 | 170774 | 23859 | 36649 | 11052 | 5722 | 
| 1975 | 1224645 | 164068 | 36970 | 9702 | 16479 | 7269 | 
| 1976 | 842503 | 292793 | 33913 | 13613 | 3774 | 9903 | 
| 1977 | 2031210 | 175216 | 51460 | 10805 | 5118 | 6221 | 
| 1978 | 1182874 | 458710 | 30998 | 18806 | 5626 | 4624 | 
| 1979 | 1501217 | 261759 | 81771 | 8976 | 7400 | 3560 | 
| 1980 | 2402563 | 312745 | 59406 | 24756 | 3996 | 4713 | 
| 1981 | 935978 | 495542 | 59635 | 17709 | 8851 | 3656 | 
| 1982 | 1473996 | 189667 | 94058 | 17091 | 6593 | 5609 | 
| 1983 | 812523 | 307603 | 33981 | 21414 | 5472 | 4483 | 
| 1984 | 1512673 | 171585 | 52509 | 8073 | 6804 | 3867 | 
| 1985 | 373193 | 326631 | 33561 | 15037 | 2834 | 4252 | 
| 1986 | 1732784 | 85257 | 58535 | 10335 | 5727 | 3011 | 
| 1987 | 679725 | 394756 | 16556 | 15334 | 3030 | 3373 | 
| 1988 | 481137 | 156642 | 71425 | 5352 | 4936 | 2354 | 
| 1989 | 839539 | 110571 | 30810 | 17153 | 1836 | 2915 | 
| 1990 | 334524 | 189667 | 20513 | 7824 | 5035 | 1658 | 
| 1991 | 389333 | 80581 | 31143 | 5956 | 2645 | 2930 | 
| 1992 | 934108 | 95889 | 15906 | 8656 | 2009 | 2037 | 
| 1993 | 424605 | 216731 | 19357 | 5305 | 2905 | 1619 | 
| 1994 | 1077196 | 107488 | 36234 | 5451 | 1702 | 1662 | 
| 1995 | 644683 | 255621 | 22998 | 9757 | 1724 | 1235 | 
| 1996 | 438360 | 161670 | 42316 | 6089 | 3540 | 1473 | 
| 1997 | 1435554 | 124654 | 31521 | 11179 | 2200 | 1958 | 
| 1998 | 149849 | 391056 | 27691 | 8759 | 3786 | 1537 | 
| 1999 | 300515 | 39511 | 62452 | 6112 | 2251 | 1701 | 
| 2000 | 446859 | 78436 | 9148 | 10420 | 1546 | 1076 | 
| 2001 | 183461 | 125496 | 13465 | 2018 | 2048 | 659 | 
| 2002 | 253002 | 52136 | 27799 | 4367 | 662 | 1014 | 
| 2003 | 121505 | 62975 | 9209 | 6193 | 967 | 468 | 
| 2004 | 233267 | 37742 | 14349 | 3051 | 2081 | 606 | 
| 2005 | 185387 | 60358 | 8803 | 3593 | 1091 | 1174 | 
| 2006 | 412499 | 51601 | 13218 | 2221 | 1141 | 999 | 
| 2007 | 185786 | 111333 | 10727 | 4226 | 1005 | 870 | 
| 2008 | 201127 | 47750 | 25004 | 3248 | 1675 | 1064 | 
| 2009 | 221680 | 53788 | 11495 | 7821 | 1425 | 1212 | 
| 2010 | 285053 | 62072 | 13221 | 3894 | 3295 | 1155 | 
| 2011 | 143128 | 82103 | 14626 | 4378 | 1781 | 2398 | 
| 2012 | 204017 | 41295 | 22040 | 6453 | 2083 | 2192 | 
| 2013 | 232016 | 55774 | 12068 | 9530 | 3258 | 2184 | 
| 2014 | 304991 | 68134 | 16722 | 5423 | 4686 | 2755 | 
| 2015 | 142643 | 94348 | 21145 | 6835 | 2601 | 4613 | 
| 2016 | 102479 | 41056 | 26666 | 10734 | 3546 | 3434 | 
| 2017 | 301243 | 29646 | 12525 | 11169 | 5659 | 3668 | 
| 2018 | 63601 | 76368 | 9081 | 5223 | 4677 | 5521 | 
| 2019 | 127649 | 17761 | 16524 | 2740 | 2386 | 5023 | 
| 2020 | 271781 | 37227 | 4805 | 5940 | 1172 | 4347 |