| Table 3. Estimated stock numbers at age. | ||||||
| Year Age | 1 | 2 | 3 | 4 | 5 | 6 |
| 1963 | 398961 | 168791 | 20025 | 10208 | 8093 | 4930 |
| 1964 | 652473 | 120432 | 51685 | 11459 | 5192 | 6728 |
| 1965 | 873624 | 206272 | 40387 | 22872 | 6169 | 5298 |
| 1966 | 1062539 | 252258 | 67691 | 16341 | 9338 | 5913 |
| 1967 | 892285 | 308596 | 72919 | 28523 | 7993 | 7903 |
| 1968 | 448938 | 263979 | 90182 | 28753 | 14281 | 6823 |
| 1969 | 392784 | 127561 | 72256 | 33987 | 11324 | 9707 |
| 1970 | 1321430 | 118660 | 38820 | 32167 | 15288 | 8117 |
| 1971 | 1736844 | 383637 | 33645 | 14946 | 16019 | 10307 |
| 1972 | 429303 | 479401 | 91041 | 12161 | 5977 | 12556 |
| 1973 | 635222 | 108979 | 106062 | 29979 | 4959 | 6933 |
| 1974 | 630694 | 163683 | 23684 | 36418 | 10946 | 5433 |
| 1975 | 1085848 | 157765 | 36901 | 9680 | 16390 | 6976 |
| 1976 | 750495 | 272400 | 34086 | 13684 | 3800 | 9644 |
| 1977 | 1831410 | 165743 | 51209 | 10817 | 5108 | 5992 |
| 1978 | 1121046 | 429578 | 30935 | 18829 | 5645 | 4505 |
| 1979 | 1398474 | 258510 | 80968 | 8918 | 7327 | 3421 |
| 1980 | 2256450 | 301424 | 59319 | 24580 | 3970 | 4565 |
| 1981 | 876632 | 482066 | 59295 | 17618 | 8771 | 3527 |
| 1982 | 1451312 | 182806 | 93741 | 17007 | 6582 | 5502 |
| 1983 | 805020 | 312374 | 33527 | 21246 | 5387 | 4392 |
| 1984 | 1491244 | 174403 | 52535 | 7971 | 6716 | 3748 |
| 1985 | 360176 | 331441 | 33311 | 14709 | 2752 | 4100 |
| 1986 | 1633426 | 84687 | 58661 | 10165 | 5598 | 2919 |
| 1987 | 619507 | 386242 | 16699 | 15432 | 2988 | 3291 |
| 1988 | 428450 | 150951 | 71757 | 5271 | 4919 | 2305 |
| 1989 | 749681 | 106209 | 30822 | 17403 | 1825 | 2895 |
| 1990 | 296442 | 181665 | 20565 | 7887 | 5104 | 1639 |
| 1991 | 341912 | 74948 | 31024 | 6023 | 2687 | 2925 |
| 1992 | 800709 | 90455 | 15187 | 8842 | 2029 | 2022 |
| 1993 | 398654 | 202580 | 18361 | 5036 | 2846 | 1564 |
| 1994 | 968988 | 107526 | 37182 | 5529 | 1727 | 1696 |
| 1995 | 554295 | 252844 | 24125 | 10390 | 1806 | 1302 |
| 1996 | 356335 | 142119 | 41435 | 5711 | 3367 | 1408 |
| 1997 | 1107052 | 101159 | 27108 | 9646 | 1866 | 1676 |
| 1998 | 113119 | 307487 | 22204 | 7118 | 3077 | 1242 |
| 1999 | 233313 | 33071 | 56271 | 5545 | 2074 | 1568 |
| 2000 | 428771 | 67246 | 8673 | 9929 | 1501 | 1063 |
| 2001 | 156318 | 127934 | 14529 | 2194 | 2278 | 737 |
| 2002 | 236601 | 48847 | 26223 | 3887 | 597 | 947 |
| 2003 | 116572 | 68051 | 11183 | 7253 | 1094 | 532 |
| 2004 | 198194 | 37685 | 14648 | 3068 | 2020 | 579 |
| 2005 | 154933 | 54888 | 8467 | 3415 | 1004 | 1055 |
| 2006 | 361914 | 47977 | 13152 | 2229 | 1109 | 931 |
| 2007 | 169768 | 104163 | 10579 | 4204 | 983 | 807 |
| 2008 | 191818 | 48061 | 24910 | 3227 | 1644 | 992 |
| 2009 | 185106 | 54561 | 11829 | 7689 | 1410 | 1141 |
| 2010 | 278579 | 55010 | 13569 | 3968 | 3230 | 1075 |
| 2011 | 134603 | 79061 | 13806 | 4292 | 1722 | 2139 |
| 2012 | 181351 | 40357 | 20643 | 5956 | 1923 | 1867 |
| 2013 | 229608 | 50947 | 11523 | 8732 | 2908 | 1811 |
| 2014 | 325131 | 64757 | 15899 | 5076 | 4211 | 2277 |
| 2015 | 158574 | 93868 | 20802 | 6540 | 2439 | 3900 |
| 2016 | 111377 | 42172 | 27543 | 10478 | 3378 | 2931 |
| 2017 | 389391 | 28315 | 13322 | 12182 | 5673 | 3319 |
| 2018 | 98162 | 98606 | 8471 | 5597 | 6414 | 5228 |