| Table 3. Estimated stock numbers at age. | ||||||||
| Year Age | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 
| 1960 | 198545 | 164708 | 183854 | 213005 | 25663 | 1745 | 1021 | 2749 | 
| 1961 | 197403 | 162516 | 134147 | 84256 | 58504 | 9001 | 855 | 1845 | 
| 1962 | 300088 | 157795 | 133349 | 59648 | 16559 | 15267 | 3890 | 1262 | 
| 1963 | 311034 | 251134 | 126374 | 57820 | 9239 | 3679 | 5864 | 2232 | 
| 1964 | 264234 | 257354 | 207754 | 52760 | 10115 | 2165 | 1321 | 3444 | 
| 1965 | 356312 | 211198 | 212998 | 92296 | 10948 | 2356 | 746 | 2134 | 
| 1966 | 300829 | 299773 | 167995 | 102672 | 28017 | 3370 | 917 | 1431 | 
| 1967 | 308904 | 242927 | 253540 | 78932 | 36096 | 9719 | 1439 | 1281 | 
| 1968 | 299600 | 252840 | 197836 | 129198 | 26009 | 13026 | 4327 | 1562 | 
| 1969 | 313296 | 245239 | 203878 | 100973 | 49359 | 11611 | 6408 | 3381 | 
| 1970 | 309663 | 257546 | 200931 | 97399 | 38353 | 21019 | 5381 | 5475 | 
| 1971 | 244348 | 256499 | 212932 | 91584 | 36655 | 16574 | 9927 | 6034 | 
| 1972 | 163864 | 201955 | 211553 | 100885 | 31969 | 15854 | 8091 | 9401 | 
| 1973 | 128335 | 133069 | 166025 | 109361 | 39618 | 15072 | 8331 | 10678 | 
| 1974 | 150421 | 102788 | 107473 | 91844 | 44520 | 18100 | 7549 | 11245 | 
| 1975 | 228220 | 121142 | 82429 | 61229 | 37933 | 19938 | 9208 | 11457 | 
| 1976 | 231590 | 191136 | 97829 | 45175 | 28722 | 17722 | 10342 | 12586 | 
| 1977 | 184324 | 192114 | 160310 | 53247 | 22354 | 12907 | 8828 | 13565 | 
| 1978 | 101057 | 153999 | 158330 | 94823 | 27880 | 11126 | 6675 | 13490 | 
| 1979 | 68385 | 81910 | 127551 | 99925 | 50285 | 14308 | 5860 | 12270 | 
| 1980 | 75205 | 54542 | 66067 | 84596 | 53607 | 25420 | 7412 | 10897 | 
| 1981 | 111803 | 60510 | 42960 | 43387 | 46721 | 26364 | 12928 | 11065 | 
| 1982 | 197436 | 90431 | 48888 | 26666 | 22298 | 20163 | 12487 | 14304 | 
| 1983 | 207823 | 166099 | 73147 | 28724 | 12568 | 9181 | 9230 | 15521 | 
| 1984 | 159378 | 173222 | 137295 | 40750 | 12837 | 5370 | 4105 | 13801 | 
| 1985 | 191969 | 127390 | 142821 | 78314 | 16644 | 5322 | 2297 | 9614 | 
| 1986 | 182015 | 159317 | 100165 | 84223 | 32149 | 7346 | 2351 | 6309 | 
| 1987 | 231063 | 147003 | 129495 | 55891 | 35683 | 14013 | 3194 | 4515 | 
| 1988 | 233765 | 191223 | 117395 | 69749 | 24279 | 14269 | 5750 | 3836 | 
| 1989 | 260772 | 190418 | 155157 | 59039 | 29496 | 9518 | 5693 | 4654 | 
| 1990 | 186519 | 218338 | 150888 | 74696 | 25476 | 12188 | 3937 | 4820 | 
| 1991 | 269646 | 147191 | 175327 | 68078 | 23839 | 9153 | 4520 | 3711 | 
| 1992 | 267121 | 225907 | 107639 | 75469 | 21018 | 8783 | 3469 | 3332 | 
| 1993 | 278633 | 221659 | 169118 | 33546 | 16890 | 5636 | 2567 | 2114 | 
| 1994 | 296124 | 222250 | 130537 | 35543 | 6360 | 2862 | 1062 | 940 | 
| 1995 | 292494 | 228080 | 114943 | 21507 | 6052 | 388 | 189 | 154 | 
| 1996 | 213571 | 211759 | 95411 | 12712 | 3585 | 496 | 6 | 4 | 
| 1997 | 220523 | 154532 | 85980 | 6437 | 1514 | 225 | 32 | 1 | 
| 1998 | 209866 | 122625 | 35495 | 3480 | 264 | 17 | 12 | 4 | 
| 1999 | 148465 | 138062 | 39312 | 2022 | 82 | 5 | 3 | 4 | 
| 2000 | 138301 | 106274 | 58461 | 4234 | 157 | 5 | 1 | 3 | 
| 2001 | 133024 | 111401 | 55342 | 8190 | 454 | 8 | 1 | 2 | 
| 2002 | 112663 | 104915 | 54953 | 7980 | 1097 | 63 | 3 | 2 | 
| 2003 | 147999 | 84251 | 47422 | 8393 | 1037 | 165 | 18 | 2 | 
| 2004 | 147651 | 113482 | 31842 | 6506 | 816 | 129 | 35 | 12 | 
| 2005 | 155448 | 112001 | 56750 | 4219 | 1222 | 72 | 23 | 23 | 
| 2006 | 172802 | 121854 | 59737 | 8925 | 928 | 70 | 4 | 16 | 
| 2007 | 150002 | 137006 | 66649 | 8278 | 1792 | 13 | 3 | 6 | 
| 2008 | 159597 | 119383 | 82561 | 11574 | 1928 | 150 | 2 | 3 | 
| 2009 | 147511 | 125642 | 63169 | 14111 | 2367 | 152 | 32 | 2 | 
| 2010 | 183137 | 118317 | 71700 | 6996 | 954 | 20 | 18 | 14 | 
| 2011 | 177765 | 148727 | 66564 | 6551 | 438 | 6 | 3 | 15 | 
| 2012 | 206237 | 143103 | 95541 | 6732 | 818 | 23 | 1 | 10 | 
| 2013 | 191906 | 169512 | 93716 | 9663 | 394 | 56 | 5 | 5 | 
| 2014 | 166760 | 156319 | 112236 | 8165 | 614 | 11 | 11 | 5 | 
| 2015 | 129044 | 134380 | 112426 | 13413 | 523 | 27 | 2 | 8 | 
| 2016 | 99002 | 108027 | 102398 | 14891 | 662 | 12 | 5 | 4 | 
| 2017 | 103268 | 79687 | 84611 | 11955 | 522 | 88 | 4 | 3 | 
| 2018 | 97584 | 85112 | 61588 | 12883 | 628 | 99 | 31 | 3 | 
| 2019 | 68642 | 81163 | 68487 | 12204 | 766 | 179 | 40 | 11 | 
| 2020 | 80337 | 54564 | 65096 | 15942 | 208 | 200 | 46 | 4 | 
| 2021 | 116194 | 65146 | 42789 | 20446 | 1733 | 88 | 56 | 1 | 
| 2022 | 114531 | 96402 | 51157 | 9926 | 812 | 509 | 15 | 0 |