| Table 3. Estimated stock numbers at age. | ||||||||
| Year Age | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 |
| 1967 | 142071 | 82039 | 57255 | 7149 | 4905 | 1148 | 740 | 676 |
| 1968 | 160758 | 92687 | 50679 | 31816 | 3735 | 2542 | 658 | 771 |
| 1969 | 286293 | 90826 | 54795 | 31152 | 20503 | 2842 | 1959 | 819 |
| 1970 | 294491 | 216664 | 49398 | 35451 | 18719 | 11757 | 1807 | 1630 |
| 1971 | 355766 | 191989 | 119462 | 24806 | 19488 | 11971 | 7854 | 2506 |
| 1972 | 223632 | 209878 | 103505 | 67659 | 14616 | 11434 | 7338 | 6506 |
| 1973 | 200557 | 111156 | 105719 | 63743 | 36033 | 8759 | 6392 | 8637 |
| 1974 | 198729 | 90257 | 48369 | 63055 | 42214 | 20711 | 5452 | 8611 |
| 1975 | 234573 | 76217 | 35331 | 24318 | 36298 | 25201 | 12071 | 8567 |
| 1976 | 406117 | 102360 | 29493 | 17395 | 12919 | 19141 | 13307 | 11674 |
| 1977 | 149608 | 148293 | 35367 | 12375 | 8657 | 7188 | 10738 | 14057 |
| 1978 | 120274 | 72310 | 57948 | 14161 | 5096 | 3996 | 3387 | 13185 |
| 1979 | 87530 | 53822 | 34771 | 29232 | 7757 | 2803 | 2209 | 9587 |
| 1980 | 85598 | 47123 | 25773 | 18703 | 16002 | 4000 | 1656 | 7686 |
| 1981 | 163800 | 42052 | 25075 | 12326 | 9585 | 8187 | 2107 | 5851 |
| 1982 | 141071 | 108779 | 23190 | 15145 | 6277 | 4773 | 3710 | 4028 |
| 1983 | 148724 | 69827 | 55200 | 11410 | 8266 | 3118 | 2489 | 3782 |
| 1984 | 255612 | 76494 | 30171 | 23893 | 4729 | 3457 | 1322 | 2774 |
| 1985 | 356211 | 108547 | 29471 | 12804 | 9469 | 2222 | 1592 | 2303 |
| 1986 | 291022 | 142018 | 32042 | 11740 | 6372 | 4488 | 1194 | 2264 |
| 1987 | 149282 | 164150 | 36003 | 10115 | 5129 | 3284 | 2283 | 1793 |
| 1988 | 138346 | 71811 | 61105 | 11355 | 4540 | 2590 | 1731 | 1916 |
| 1989 | 102379 | 69696 | 27666 | 21651 | 4704 | 2090 | 1238 | 1634 |
| 1990 | 150847 | 48109 | 25629 | 11076 | 8366 | 2312 | 1028 | 1399 |
| 1991 | 173865 | 71394 | 17317 | 10190 | 5241 | 3805 | 1241 | 1387 |
| 1992 | 103938 | 88052 | 25851 | 6762 | 5141 | 2838 | 2062 | 1475 |
| 1993 | 176026 | 59131 | 33505 | 9044 | 2914 | 3077 | 1780 | 2225 |
| 1994 | 118232 | 97165 | 28409 | 13207 | 3420 | 1389 | 1431 | 2083 |
| 1995 | 215914 | 66818 | 41620 | 12838 | 6291 | 1596 | 890 | 1836 |
| 1996 | 119988 | 149079 | 29728 | 19351 | 6856 | 2421 | 680 | 1249 |
| 1997 | 151424 | 79932 | 89505 | 13150 | 9079 | 3290 | 1059 | 893 |
| 1998 | 89702 | 121786 | 45446 | 48446 | 7158 | 4469 | 1761 | 953 |
| 1999 | 114833 | 56656 | 74572 | 22751 | 26293 | 4104 | 2245 | 1457 |
| 2000 | 100161 | 95973 | 29950 | 37161 | 11123 | 12418 | 1890 | 1554 |
| 2001 | 206390 | 68933 | 65516 | 14523 | 17801 | 6368 | 6687 | 1461 |
| 2002 | 159646 | 143641 | 35579 | 34957 | 8344 | 9699 | 3835 | 4730 |
| 2003 | 163119 | 119858 | 83289 | 16812 | 17257 | 5214 | 5199 | 4739 |
| 2004 | 115707 | 107822 | 74289 | 47769 | 8018 | 8132 | 3183 | 4463 |
| 2005 | 145118 | 75852 | 67304 | 49740 | 27459 | 4962 | 4430 | 4146 |
| 2006 | 102586 | 125332 | 43215 | 37893 | 27387 | 14207 | 3070 | 4757 |
| 2007 | 155189 | 56487 | 79895 | 25453 | 20469 | 15443 | 7385 | 4411 |
| 2008 | 74785 | 98820 | 31767 | 49607 | 16070 | 11639 | 10462 | 8446 |
| 2009 | 58808 | 52447 | 44591 | 15037 | 25749 | 10112 | 6238 | 10942 |
| 2010 | 88970 | 38361 | 28522 | 20566 | 7321 | 13636 | 5931 | 10316 |
| 2011 | 80412 | 77383 | 22695 | 14406 | 10247 | 3780 | 6852 | 10678 |
| 2012 | 133590 | 46453 | 46334 | 12057 | 7509 | 5122 | 2073 | 9811 |
| 2013 | 91938 | 100245 | 22592 | 26094 | 6863 | 4071 | 2741 | 6759 |
| 2014 | 54657 | 68097 | 55288 | 12787 | 14577 | 4074 | 2131 | 5521 |
| 2015 | 97225 | 40282 | 45881 | 31230 | 7374 | 7944 | 2618 | 4505 |