| Table 2. Estimated stock numbers. | |||||||
| Year\Age | 1 | 2 | 3 | 4 | 5 | 6 | 7+ | 
| 1963 | 486504 | 189283 | 20576 | 10325 | 8407 | 3295 | 1626 | 
| 1964 | 815046 | 133653 | 52365 | 11594 | 5290 | 4612 | 2254 | 
| 1965 | 1035091 | 230499 | 40538 | 23133 | 6347 | 2558 | 3021 | 
| 1966 | 1282087 | 274306 | 67914 | 16528 | 9584 | 3307 | 2864 | 
| 1967 | 1120180 | 339422 | 72258 | 28624 | 7876 | 4703 | 3295 | 
| 1968 | 571489 | 296559 | 89322 | 28283 | 14231 | 3417 | 3502 | 
| 1969 | 497325 | 144640 | 72984 | 33860 | 11226 | 6684 | 3070 | 
| 1970 | 1612022 | 133119 | 38910 | 32241 | 15298 | 4617 | 3930 | 
| 1971 | 2132915 | 421258 | 33827 | 15009 | 15744 | 6687 | 4111 | 
| 1972 | 513497 | 533386 | 90944 | 12178 | 6061 | 6789 | 5588 | 
| 1973 | 784655 | 119970 | 106831 | 29733 | 4978 | 2522 | 4490 | 
| 1974 | 726505 | 183873 | 24077 | 36644 | 10998 | 2183 | 3209 | 
| 1975 | 1262999 | 169228 | 37534 | 9663 | 16413 | 4620 | 2307 | 
| 1976 | 807744 | 289816 | 34303 | 13718 | 3954 | 6870 | 2782 | 
| 1977 | 2067809 | 170246 | 52208 | 10923 | 5263 | 1783 | 4114 | 
| 1978 | 1213477 | 447754 | 31163 | 18704 | 5381 | 2291 | 2281 | 
| 1979 | 1461538 | 259886 | 81797 | 9106 | 7260 | 1781 | 1783 | 
| 1980 | 2436322 | 298045 | 58983 | 24934 | 4036 | 2823 | 1733 | 
| 1981 | 954554 | 481182 | 58983 | 17778 | 9007 | 1656 | 1845 | 
| 1982 | 1636385 | 183322 | 92134 | 17028 | 6661 | 3822 | 1479 | 
| 1983 | 868046 | 313326 | 32893 | 21214 | 5438 | 2439 | 1829 | 
| 1984 | 1656140 | 172129 | 52000 | 8004 | 6746 | 2018 | 1596 | 
| 1985 | 361855 | 328733 | 33124 | 14709 | 2807 | 2602 | 1377 | 
| 1986 | 1797667 | 80258 | 57989 | 10217 | 5517 | 1144 | 1636 | 
| 1987 | 661325 | 383847 | 16136 | 15288 | 3087 | 1990 | 1044 | 
| 1988 | 452707 | 147709 | 69843 | 5131 | 4932 | 1228 | 952 | 
| 1989 | 827364 | 104089 | 30031 | 17259 | 1799 | 1883 | 835 | 
| 1990 | 317426 | 181498 | 19990 | 7799 | 5064 | 631 | 928 | 
| 1991 | 357539 | 74533 | 30577 | 5957 | 2633 | 1928 | 703 | 
| 1992 | 833176 | 87728 | 14616 | 8591 | 1979 | 923 | 862 | 
| 1993 | 391601 | 193687 | 17011 | 4754 | 2693 | 726 | 606 | 
| 1994 | 934718 | 98815 | 34303 | 5155 | 1638 | 950 | 468 | 
| 1995 | 552937 | 228891 | 21504 | 9549 | 1660 | 600 | 483 | 
| 1996 | 338067 | 131926 | 36098 | 5215 | 2941 | 619 | 453 | 
| 1997 | 1169398 | 89232 | 23957 | 8701 | 1740 | 965 | 341 | 
| 1998 | 129573 | 290977 | 19180 | 6513 | 2678 | 614 | 392 | 
| 1999 | 246225 | 34269 | 50362 | 4983 | 1884 | 792 | 393 | 
| 2000 | 467895 | 64926 | 7883 | 9732 | 1365 | 550 | 306 | 
| 2001 | 160332 | 124991 | 13277 | 2091 | 2127 | 308 | 256 | 
| 2002 | 248948 | 45936 | 23813 | 3706 | 547 | 549 | 165 | 
| 2003 | 120692 | 66436 | 9833 | 6681 | 991 | 160 | 202 | 
| 2004 | 212140 | 36461 | 13611 | 2929 | 1825 | 296 | 108 | 
| 2005 | 153891 | 54394 | 7716 | 3365 | 916 | 594 | 129 | 
| 2006 | 366590 | 44936 | 11669 | 2090 | 959 | 308 | 245 | 
| 2007 | 171785 | 98913 | 9405 | 3776 | 846 | 309 | 168 | 
| 2008 | 204843 | 47052 | 21777 | 3007 | 1400 | 376 | 192 | 
| 2009 | 204434 | 54448 | 10784 | 7084 | 1209 | 471 | 190 | 
| 2010 | 321901 | 56500 | 12506 | 3784 | 2721 | 405 | 198 | 
| 2011 | 154353 | 84626 | 13255 | 4266 | 1565 | 1029 | 209 | 
| 2012 | 194464 | 42959 | 20864 | 6183 | 1808 | 658 | 449 | 
| 2013 | 252458 | 48050 | 11670 | 9709 | 3119 | 753 | 466 | 
| 2014 | 346972 | 61451 | 12454 | 5535 | 4996 | 1648 | 633 |