| Table 2. Estimated stock numbers. | |||||||
| Year\Age | 1 | 2 | 3 | 4 | 5 | 6 | 7+ | 
| 1963 | 462314 | 194075 | 21316 | 10308 | 8572 | 3302 | 1635 | 
| 1964 | 845768 | 137036 | 53210 | 11616 | 5324 | 4644 | 2309 | 
| 1965 | 1068750 | 244019 | 40782 | 23110 | 6382 | 2626 | 3140 | 
| 1966 | 1373675 | 286932 | 69633 | 16711 | 9870 | 3347 | 2926 | 
| 1967 | 1268062 | 357182 | 74013 | 29173 | 7963 | 4818 | 3310 | 
| 1968 | 650177 | 320296 | 91400 | 28226 | 14363 | 3524 | 3610 | 
| 1969 | 601992 | 155127 | 76420 | 33962 | 11356 | 6714 | 3156 | 
| 1970 | 1845019 | 146239 | 39775 | 32112 | 15269 | 4745 | 4068 | 
| 1971 | 2378546 | 446860 | 35277 | 14942 | 15522 | 6785 | 4183 | 
| 1972 | 584201 | 561856 | 94656 | 12318 | 6122 | 6740 | 5498 | 
| 1973 | 877647 | 129314 | 111860 | 29733 | 5000 | 2532 | 4568 | 
| 1974 | 809361 | 196418 | 25668 | 37049 | 11056 | 2160 | 3169 | 
| 1975 | 1393041 | 180232 | 39656 | 9651 | 16270 | 4605 | 2280 | 
| 1976 | 859409 | 315212 | 35954 | 13750 | 3960 | 6811 | 2773 | 
| 1977 | 2118036 | 186279 | 55715 | 11218 | 5293 | 1737 | 4035 | 
| 1978 | 1268062 | 475918 | 32991 | 18815 | 5232 | 2267 | 2281 | 
| 1979 | 1438340 | 284361 | 85306 | 9364 | 7211 | 1795 | 1788 | 
| 1980 | 2285282 | 313013 | 61698 | 25135 | 4033 | 2809 | 1692 | 
| 1981 | 884697 | 496332 | 62007 | 17947 | 9185 | 1639 | 1831 | 
| 1982 | 1409859 | 186839 | 96086 | 17127 | 6743 | 3802 | 1454 | 
| 1983 | 820771 | 298642 | 34614 | 21662 | 5536 | 2471 | 1843 | 
| 1984 | 1438340 | 177726 | 55492 | 8263 | 6931 | 2047 | 1604 | 
| 1985 | 377000 | 315843 | 36098 | 15823 | 2954 | 2661 | 1392 | 
| 1986 | 1711704 | 85391 | 62069 | 10636 | 5788 | 1178 | 1649 | 
| 1987 | 671319 | 397122 | 17947 | 15956 | 3297 | 2054 | 1056 | 
| 1988 | 462314 | 157629 | 74982 | 5430 | 5135 | 1273 | 997 | 
| 1989 | 777625 | 109098 | 32630 | 17919 | 1869 | 1937 | 855 | 
| 1990 | 333701 | 186093 | 21662 | 8175 | 5229 | 658 | 965 | 
| 1991 | 370645 | 81634 | 34132 | 6219 | 2727 | 1987 | 708 | 
| 1992 | 798907 | 94278 | 16890 | 9250 | 2088 | 982 | 919 | 
| 1993 | 444631 | 208564 | 20742 | 5519 | 3083 | 812 | 687 | 
| 1994 | 960299 | 114691 | 42193 | 6040 | 1904 | 1108 | 541 | 
| 1995 | 559053 | 256530 | 26716 | 11514 | 1952 | 709 | 575 | 
| 1996 | 402721 | 148153 | 47858 | 6445 | 3594 | 734 | 529 | 
| 1997 | 1069819 | 109974 | 31382 | 10868 | 2131 | 1176 | 413 | 
| 1998 | 167879 | 294785 | 24959 | 7835 | 3193 | 735 | 481 | 
| 1999 | 301342 | 44445 | 60658 | 5866 | 2211 | 931 | 452 | 
| 2000 | 548532 | 83700 | 11253 | 11842 | 1644 | 678 | 387 | 
| 2001 | 206695 | 158736 | 19934 | 2732 | 2775 | 408 | 336 | 
| 2002 | 257301 | 58630 | 37459 | 5110 | 773 | 757 | 224 | 
| 2003 | 120090 | 72042 | 16068 | 8968 | 1441 | 231 | 273 | 
| 2004 | 204025 | 34475 | 16747 | 4187 | 2558 | 383 | 174 | 
| 2005 | 142201 | 57931 | 9115 | 4110 | 1198 | 918 | 171 | 
| 2006 | 366224 | 40946 | 15761 | 2674 | 1198 | 386 | 359 | 
| 2007 | 150844 | 110525 | 12132 | 4823 | 1023 | 415 | 252 | 
| 2008 | 183139 | 44223 | 31634 | 3434 | 1731 | 416 | 284 | 
| 2009 | 203008 | 55271 | 13281 | 8993 | 1449 | 641 | 280 | 
| 2010 | 320616 | 62755 | 17739 | 4563 | 3625 | 598 | 328 | 
| 2011 | 166708 | 100007 | 20457 | 5674 | 2002 | 1659 | 352 | 
| 2012 | 300439 | 51948 | 33490 | 7953 | 2428 | 868 | 749 | 
| 2013 | 291268 | 92411 | 17135 | 11605 | 3518 | 1049 | 654 |