| Table 3. Estimated stock numbers at age. | ||||||||||
| Year Age | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 |
| 1940 | 33199 | 26304 | 19691 | 14750 | 10255 | 6557 | 3976 | 2229 | 1088 | 1197 |
| 1941 | 33447 | 26604 | 20053 | 14729 | 10397 | 6620 | 4020 | 2163 | 1167 | 1214 |
| 1942 | 33773 | 26833 | 20272 | 15034 | 10358 | 6737 | 4073 | 2196 | 1148 | 1263 |
| 1943 | 34253 | 27101 | 20477 | 15203 | 10636 | 6681 | 4175 | 2241 | 1173 | 1288 |
| 1944 | 34868 | 27530 | 20699 | 15384 | 10766 | 6938 | 4104 | 2328 | 1208 | 1327 |
| 1945 | 35966 | 28069 | 21111 | 15574 | 10923 | 7038 | 4342 | 2254 | 1279 | 1393 |
| 1946 | 35679 | 29054 | 21508 | 15889 | 11068 | 7150 | 4416 | 2389 | 1240 | 1470 |
| 1947 | 33671 | 28863 | 22335 | 16174 | 11299 | 7256 | 4498 | 2434 | 1317 | 1494 |
| 1948 | 30460 | 27206 | 22211 | 16845 | 11494 | 7416 | 4577 | 2482 | 1343 | 1551 |
| 1949 | 28290 | 24372 | 20899 | 16762 | 12005 | 7539 | 4687 | 2528 | 1370 | 1597 |
| 1950 | 26628 | 22671 | 18526 | 15735 | 11948 | 7893 | 4763 | 2586 | 1394 | 1636 |
| 1951 | 28065 | 21038 | 17245 | 13798 | 11214 | 7903 | 5031 | 2635 | 1426 | 1673 |
| 1952 | 31963 | 22270 | 15735 | 12791 | 9600 | 7240 | 4943 | 2708 | 1415 | 1666 |
| 1953 | 34489 | 25824 | 16708 | 11469 | 8832 | 6015 | 4410 | 2586 | 1420 | 1616 |
| 1954 | 36204 | 27767 | 19759 | 12259 | 7841 | 5569 | 3633 | 2307 | 1363 | 1593 |
| 1955 | 32916 | 29657 | 21275 | 15019 | 8824 | 5254 | 3649 | 2083 | 1319 | 1694 |
| 1956 | 27838 | 26678 | 23025 | 15879 | 10645 | 5750 | 3329 | 2012 | 1149 | 1661 |
| 1957 | 24346 | 22230 | 20510 | 17538 | 11288 | 7064 | 3677 | 1852 | 1120 | 1563 |
| 1958 | 21724 | 19473 | 16821 | 15475 | 12814 | 7581 | 4638 | 2071 | 1036 | 1507 |
| 1959 | 19875 | 17341 | 14675 | 12321 | 10729 | 8211 | 4691 | 2448 | 1093 | 1342 |
| 1960 | 19091 | 15809 | 13046 | 10795 | 8522 | 6884 | 5171 | 2498 | 1298 | 1293 |
| 1961 | 17577 | 15368 | 11810 | 9506 | 7327 | 5220 | 4130 | 2614 | 1267 | 1315 |
| 1962 | 15476 | 14157 | 11643 | 8603 | 6493 | 4538 | 3121 | 2104 | 1340 | 1322 |
| 1963 | 13296 | 12442 | 10781 | 8712 | 6104 | 4317 | 2932 | 1744 | 1174 | 1486 |
| 1964 | 11775 | 10600 | 9420 | 8001 | 6157 | 3992 | 2797 | 1619 | 957 | 1470 |
| 1965 | 11094 | 9334 | 7917 | 6878 | 5436 | 3796 | 2417 | 1427 | 828 | 1238 |
| 1966 | 10987 | 8811 | 6948 | 5769 | 4748 | 3419 | 2329 | 1261 | 746 | 1077 |
| 1967 | 13073 | 8566 | 6575 | 5056 | 4006 | 3075 | 2163 | 1251 | 676 | 979 |
| 1968 | 17104 | 10312 | 6256 | 4763 | 3450 | 2531 | 1933 | 1138 | 655 | 870 |
| 1969 | 23723 | 13550 | 7596 | 4405 | 3168 | 2060 | 1495 | 946 | 560 | 748 |
| 1970 | 24904 | 19718 | 10075 | 5459 | 2927 | 1935 | 1225 | 750 | 478 | 655 |
| 1971 | 25375 | 20027 | 15503 | 7492 | 3931 | 1937 | 1268 | 691 | 422 | 639 |
| 1972 | 24995 | 20401 | 15151 | 11797 | 5198 | 2555 | 1232 | 688 | 375 | 576 |
| 1973 | 24499 | 20012 | 15436 | 11237 | 8707 | 3404 | 1661 | 676 | 376 | 521 |
| 1974 | 25386 | 19421 | 14981 | 11182 | 7502 | 5403 | 2068 | 854 | 349 | 463 |
| 1975 | 27526 | 20173 | 14485 | 11086 | 8011 | 4939 | 3572 | 1136 | 465 | 443 |
| 1976 | 32921 | 21683 | 14971 | 10367 | 7474 | 4963 | 3014 | 1825 | 583 | 466 |
| 1977 | 40672 | 26186 | 16017 | 10865 | 7125 | 4771 | 3131 | 1602 | 969 | 557 |
| 1978 | 51242 | 32405 | 19511 | 11492 | 7449 | 4514 | 2995 | 1654 | 846 | 806 |
| 1979 | 60732 | 41294 | 24199 | 14121 | 7786 | 4709 | 2809 | 1573 | 872 | 870 |
| 1980 | 61585 | 49625 | 31281 | 17719 | 9882 | 5026 | 3007 | 1522 | 852 | 944 |
| 1981 | 57904 | 49756 | 38086 | 23030 | 12289 | 6412 | 3176 | 1615 | 820 | 966 |
| 1982 | 54543 | 46290 | 37815 | 28825 | 16709 | 8297 | 4232 | 1762 | 891 | 987 |
| 1983 | 55449 | 43075 | 34518 | 27509 | 19955 | 10704 | 5220 | 2207 | 916 | 977 |
| 1984 | 56666 | 44184 | 31625 | 24696 | 18525 | 12428 | 6543 | 2639 | 1116 | 957 |
| 1985 | 58989 | 45068 | 32798 | 22461 | 16627 | 11487 | 7545 | 3251 | 1310 | 1028 |
| 1986 | 58040 | 47400 | 33366 | 23529 | 14976 | 10284 | 6941 | 3736 | 1612 | 1159 |
| 1987 | 53307 | 46722 | 35446 | 23914 | 16002 | 9339 | 6312 | 3529 | 1900 | 1410 |
| 1988 | 47637 | 42668 | 35031 | 25607 | 16117 | 10046 | 5671 | 3189 | 1790 | 1678 |
| 1989 | 44324 | 37800 | 31990 | 25811 | 18093 | 10567 | 6440 | 3012 | 1686 | 1835 |
| 1990 | 43136 | 35104 | 27858 | 22997 | 17643 | 11599 | 6611 | 3364 | 1570 | 1836 |
| 1991 | 45820 | 33960 | 25880 | 19869 | 15629 | 11241 | 7285 | 3468 | 1759 | 1781 |
| 1992 | 48700 | 36502 | 24832 | 18382 | 13304 | 9833 | 6991 | 3865 | 1843 | 1881 |
| 1993 | 52088 | 38794 | 27109 | 17631 | 12469 | 8467 | 6192 | 3818 | 2118 | 2041 |
| 1994 | 55521 | 41568 | 28829 | 19572 | 12059 | 8149 | 5440 | 3499 | 2166 | 2355 |
| 1995 | 56668 | 44608 | 31185 | 21061 | 13798 | 8017 | 5372 | 3130 | 2009 | 2600 |
| 1996 | 55366 | 45472 | 33375 | 22526 | 14531 | 9110 | 5193 | 3053 | 1782 | 2617 |
| 1997 | 53063 | 44294 | 34129 | 24389 | 15816 | 9714 | 6019 | 2970 | 1740 | 2515 |
| 1998 | 49276 | 42447 | 32818 | 24425 | 16505 | 10096 | 6105 | 3235 | 1596 | 2287 |
| 1999 | 45587 | 39234 | 31415 | 23312 | 16366 | 10279 | 6125 | 3092 | 1640 | 1968 |
| 2000 | 42406 | 36215 | 28825 | 22287 | 15498 | 10063 | 6058 | 2912 | 1470 | 1715 |
| 2001 | 43814 | 33188 | 26493 | 20287 | 14690 | 9306 | 5762 | 2678 | 1283 | 1404 |
| 2002 | 41724 | 35149 | 23753 | 18372 | 13028 | 8574 | 5158 | 2452 | 1138 | 1142 |
| 2003 | 36272 | 33511 | 25809 | 16200 | 11744 | 7523 | 4709 | 2166 | 1028 | 956 |
| 2004 | 28687 | 29135 | 24573 | 17999 | 10165 | 6759 | 4113 | 1994 | 918 | 841 |
| 2005 | 25236 | 22408 | 21434 | 17249 | 11692 | 5814 | 3719 | 1752 | 849 | 749 |
| 2006 | 25331 | 19637 | 15995 | 14979 | 11069 | 6779 | 3133 | 1588 | 753 | 687 |
| 2007 | 19641 | 20846 | 14073 | 11078 | 10088 | 6858 | 3995 | 1447 | 736 | 668 |
| 2008 | 39732 | 13625 | 15727 | 9634 | 7135 | 6219 | 4087 | 1954 | 691 | 671 |
| 2009 | 62754 | 32626 | 8669 | 11347 | 6179 | 4257 | 3735 | 2062 | 975 | 656 |
| 2010 | 60416 | 52585 | 24083 | 5655 | 7738 | 3454 | 2432 | 1836 | 916 | 739 |
| 2011 | 29509 | 48938 | 40231 | 16756 | 3769 | 5301 | 1960 | 1308 | 896 | 769 |
| 2012 | 24571 | 24329 | 36058 | 29019 | 10352 | 2596 | 3627 | 1185 | 755 | 961 |
| 2013 | 28099 | 19475 | 17891 | 24001 | 17964 | 5919 | 1876 | 2287 | 771 | 1226 |
| 2014 | 32284 | 20892 | 16278 | 15037 | 16512 | 11059 | 3418 | 1227 | 1417 | 1466 |
| 2015 | 23679 | 28205 | 18389 | 14322 | 11641 | 10429 | 6147 | 1803 | 640 | 1455 |
| 2016 | 16960 | 17867 | 22011 | 15133 | 10859 | 8557 | 6447 | 3364 | 1051 | 1082 |
| 2017 | 30042 | 13365 | 13829 | 16839 | 11622 | 7447 | 5624 | 3421 | 1851 | 1313 |
| 2018 | 25902 | 24079 | 10229 | 10629 | 12825 | 7476 | 4786 | 2949 | 1560 | 1560 |
| 2019 | 57263 | 21277 | 20245 | 8194 | 8436 | 8455 | 4590 | 2448 | 1448 | 1432 |
| 2020 | 45247 | 50545 | 16043 | 14109 | 6490 | 5703 | 4892 | 2308 | 1125 | 1390 |
| 2021 | 50397 | 39232 | 37209 | 11764 | 9229 | 4771 | 3730 | 2475 | 1168 | 1185 |
| 2022 | 35121 | 37950 | 30698 | 25671 | 8357 | 5567 | 3101 | 2087 | 1321 | 1241 |
| 2023 | 21232 | 28563 | 26429 | 23046 | 16548 | 5759 | 3253 | 1821 | 1170 | 1328 |
| 2024 | 27524 | 16722 | 25426 | 21987 | 17466 | 10407 | 3715 | 1682 | 1018 | 1281 |
| 2025 | 33240 | 22282 | 13890 | 21563 | 16898 | 12338 | 6326 | 2224 | 997 | 1317 |