| Table 3. Estimated stock numbers at age. | ||||||
| Year Age | 1 | 2 | 3 | 4 | 5 | 6 |
| 1963 | 398813 | 168971 | 19928 | 10175 | 8049 | 4840 |
| 1964 | 650787 | 120383 | 51610 | 11438 | 5171 | 6624 |
| 1965 | 874737 | 206017 | 40405 | 22848 | 6154 | 5202 |
| 1966 | 1062791 | 252515 | 67694 | 16296 | 9282 | 5826 |
| 1967 | 890416 | 308633 | 72925 | 28455 | 7977 | 7804 |
| 1968 | 448607 | 263590 | 90226 | 28751 | 14260 | 6722 |
| 1969 | 392287 | 127477 | 72076 | 33919 | 11284 | 9588 |
| 1970 | 1321581 | 118662 | 38835 | 32099 | 15240 | 7979 |
| 1971 | 1734630 | 384000 | 33671 | 14946 | 16011 | 10166 |
| 1972 | 428907 | 479075 | 91140 | 12163 | 5975 | 12453 |
| 1973 | 635308 | 108816 | 106045 | 29997 | 4957 | 6834 |
| 1974 | 631420 | 163628 | 23626 | 36344 | 10907 | 5364 |
| 1975 | 1085252 | 157670 | 36855 | 9688 | 16372 | 6888 |
| 1976 | 753115 | 272073 | 34082 | 13702 | 3797 | 9536 |
| 1977 | 1832239 | 165943 | 51092 | 10780 | 5101 | 5923 |
| 1978 | 1119599 | 429225 | 30905 | 18829 | 5660 | 4451 |
| 1979 | 1400684 | 258097 | 80929 | 8889 | 7312 | 3367 |
| 1980 | 2261202 | 300981 | 59350 | 24546 | 3967 | 4508 |
| 1981 | 876232 | 482148 | 59284 | 17607 | 8741 | 3480 |
| 1982 | 1439493 | 182278 | 93922 | 17017 | 6581 | 5453 |
| 1983 | 799095 | 309726 | 33567 | 21242 | 5389 | 4342 |
| 1984 | 1481809 | 173198 | 52430 | 7957 | 6712 | 3703 |
| 1985 | 357612 | 329112 | 33216 | 14676 | 2748 | 4049 |
| 1986 | 1624227 | 84152 | 58493 | 10149 | 5596 | 2883 |
| 1987 | 616433 | 384235 | 16674 | 15409 | 2982 | 3253 |
| 1988 | 425530 | 150284 | 71708 | 5275 | 4909 | 2271 |
| 1989 | 746029 | 105504 | 30758 | 17340 | 1825 | 2862 |
| 1990 | 294909 | 180665 | 20508 | 7861 | 5073 | 1610 |
| 1991 | 339812 | 74505 | 30867 | 5996 | 2676 | 2885 |
| 1992 | 796566 | 89893 | 15110 | 8804 | 2020 | 1982 |
| 1993 | 396390 | 201093 | 18150 | 4993 | 2814 | 1525 |
| 1994 | 960709 | 106771 | 36753 | 5458 | 1704 | 1651 |
| 1995 | 548161 | 250568 | 23845 | 10264 | 1780 | 1262 |
| 1996 | 351814 | 140436 | 40884 | 5631 | 3328 | 1372 |
| 1997 | 1092145 | 99874 | 26763 | 9514 | 1845 | 1631 |
| 1998 | 111606 | 303344 | 21838 | 7001 | 3026 | 1201 |
| 1999 | 228998 | 32631 | 55271 | 5438 | 2035 | 1521 |
| 2000 | 421690 | 66051 | 8556 | 9727 | 1474 | 1027 |
| 2001 | 153564 | 125887 | 14278 | 2162 | 2237 | 711 |
| 2002 | 233513 | 47921 | 25750 | 3825 | 587 | 915 |
| 2003 | 114333 | 66947 | 10962 | 7121 | 1068 | 509 |
| 2004 | 195535 | 37082 | 14410 | 3017 | 1977 | 555 |
| 2005 | 154082 | 54204 | 8379 | 3365 | 991 | 1018 |
| 2006 | 357795 | 47846 | 13075 | 2206 | 1097 | 901 |
| 2007 | 168244 | 103314 | 10506 | 4171 | 972 | 774 |
| 2008 | 191124 | 47706 | 24744 | 3183 | 1617 | 954 |
| 2009 | 182946 | 54174 | 11713 | 7586 | 1386 | 1090 |
| 2010 | 274478 | 54461 | 13420 | 3899 | 3161 | 1019 |
| 2011 | 132197 | 77978 | 13616 | 4195 | 1674 | 2025 |
| 2012 | 179119 | 39683 | 20246 | 5811 | 1858 | 1748 |
| 2013 | 225280 | 50248 | 11280 | 8453 | 2796 | 1683 |
| 2014 | 316045 | 63431 | 15583 | 4912 | 4030 | 2103 |
| 2015 | 154278 | 91039 | 20151 | 6253 | 2319 | 3594 |
| 2016 | 109543 | 40776 | 26185 | 9870 | 3154 | 2635 |
| 2017 | 369269 | 27859 | 12517 | 10898 | 5177 | 2921 |
| 2018 | 89754 | 92200 | 8269 | 4959 | 4766 | 4493 |