| Table 3. Estimated stock numbers at age. | |||||||||
| Year Age | 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 
| 1972 | 12481508 | 12472853 | 2215203 | 73961 | 45612 | 419023 | 7976 | 492 | 1197 | 
| 1973 | 32382948 | 3312118 | 2523383 | 528434 | 16925 | 11794 | 133491 | 2610 | 784 | 
| 1974 | 65961869 | 9055063 | 615091 | 671228 | 127992 | 4586 | 3818 | 43671 | 1000 | 
| 1975 | 6253210 | 18798994 | 1743177 | 145423 | 172320 | 34533 | 1520 | 1261 | 12468 | 
| 1976 | 7176485 | 1662762 | 3703866 | 404727 | 31388 | 44529 | 10365 | 454 | 3840 | 
| 1977 | 10608898 | 1926164 | 308130 | 951944 | 86759 | 8158 | 13239 | 3172 | 1319 | 
| 1978 | 18816349 | 2861102 | 357125 | 75070 | 230025 | 21310 | 2492 | 4095 | 1905 | 
| 1979 | 30190041 | 5020513 | 565496 | 88770 | 16835 | 60821 | 6102 | 753 | 1819 | 
| 1980 | 8057794 | 8062303 | 1040881 | 158301 | 20565 | 4597 | 19707 | 1923 | 885 | 
| 1981 | 13314077 | 2013650 | 1716621 | 327666 | 42185 | 5764 | 1633 | 7033 | 789 | 
| 1982 | 8209592 | 3412881 | 414822 | 624185 | 101203 | 14585 | 2178 | 713 | 2880 | 
| 1983 | 23571017 | 2032984 | 741273 | 146744 | 197327 | 34050 | 6091 | 858 | 1695 | 
| 1984 | 6076451 | 6159396 | 470891 | 250033 | 45194 | 61710 | 11652 | 2253 | 896 | 
| 1985 | 7772056 | 1515262 | 1463894 | 174856 | 73713 | 13811 | 20921 | 3904 | 1208 | 
| 1986 | 12426637 | 1981516 | 358916 | 510518 | 47899 | 20387 | 4450 | 6880 | 1444 | 
| 1987 | 2050442 | 3377819 | 486622 | 113332 | 132501 | 12321 | 5873 | 1407 | 3936 | 
| 1988 | 2078642 | 533641 | 916668 | 149109 | 28613 | 34440 | 3725 | 1631 | 2537 | 
| 1989 | 3180584 | 556510 | 146007 | 323278 | 36528 | 7484 | 11661 | 1250 | 1331 | 
| 1990 | 7361726 | 870784 | 152871 | 52008 | 88332 | 9592 | 2409 | 3966 | 780 | 
| 1991 | 10650986 | 2103201 | 247663 | 48556 | 14310 | 25919 | 3187 | 867 | 2296 | 
| 1992 | 13988899 | 2912816 | 616146 | 79173 | 11318 | 3714 | 8254 | 980 | 1492 | 
| 1993 | 4902053 | 3809433 | 780922 | 218990 | 24426 | 3534 | 1085 | 3109 | 1515 | 
| 1994 | 15818810 | 1353586 | 985074 | 224648 | 57127 | 7301 | 1224 | 350 | 2243 | 
| 1995 | 6656102 | 4738957 | 389911 | 320536 | 59660 | 17215 | 2735 | 469 | 1356 | 
| 1996 | 7502258 | 1774711 | 1331332 | 151519 | 101113 | 19728 | 6583 | 1210 | 560 | 
| 1997 | 3581253 | 2184346 | 495975 | 490614 | 48207 | 31402 | 7273 | 2805 | 596 | 
| 1998 | 3000396 | 1020194 | 587693 | 183188 | 163402 | 17192 | 11665 | 3309 | 1481 | 
| 1999 | 33079679 | 823287 | 284003 | 197344 | 58566 | 51288 | 6236 | 4992 | 2138 | 
| 2000 | 8487617 | 9599933 | 234552 | 94431 | 49872 | 17078 | 15380 | 2436 | 1646 | 
| 2001 | 1376701 | 2375815 | 2612866 | 92463 | 28853 | 15040 | 6708 | 6173 | 1585 | 
| 2002 | 1603310 | 391693 | 684768 | 1095952 | 30625 | 11313 | 6372 | 3659 | 3275 | 
| 2003 | 1244807 | 431492 | 112996 | 329662 | 463485 | 11731 | 4995 | 3347 | 2563 | 
| 2004 | 1210055 | 345398 | 124964 | 57560 | 165801 | 232115 | 5856 | 2841 | 1931 | 
| 2005 | 5156485 | 329794 | 96179 | 58882 | 27822 | 79383 | 118431 | 3606 | 1789 | 
| 2006 | 1554535 | 1566952 | 92145 | 46352 | 26132 | 13770 | 37811 | 65592 | 2660 | 
| 2007 | 1148449 | 439887 | 495076 | 42531 | 19913 | 11172 | 6434 | 19876 | 26133 | 
| 2008 | 918049 | 331872 | 127540 | 246794 | 18029 | 8323 | 5294 | 3483 | 16631 | 
| 2009 | 4357762 | 271635 | 94492 | 66432 | 131733 | 8353 | 4114 | 3141 | 6186 | 
| 2010 | 554009 | 1432163 | 84525 | 52970 | 36855 | 76178 | 4604 | 2487 | 3738 | 
| 2011 | 352799 | 173139 | 455463 | 48125 | 29642 | 21132 | 46794 | 2665 | 2466 | 
| 2012 | 621219 | 109790 | 54741 | 261447 | 24938 | 16959 | 12048 | 28473 | 2253 | 
| 2013 | 661183 | 203827 | 32540 | 31414 | 151160 | 12507 | 9302 | 6926 | 15987 | 
| 2014 | 3703034 | 217196 | 61489 | 16346 | 19615 | 87512 | 6376 | 5449 | 9527 | 
| 2015 | 1176998 | 1273824 | 65772 | 29978 | 7638 | 10579 | 48786 | 3739 | 6043 | 
| 2016 | 1304307 | 412009 | 377730 | 29234 | 12457 | 3235 | 4501 | 28248 | 2549 | 
| 2017 | 600699 | 483749 | 130044 | 184007 | 12710 | 5384 | 1430 | 2650 | 10950 | 
| 2018 | 1735166 | 223256 | 147156 | 60438 | 91130 | 5201 | 2484 | 803 | 4325 | 
| 2019 | 4656400 | 697453 | 69245 | 71881 | 25578 | 46080 | 2324 | 1275 | 1238 | 
| 2020 | 5344868 | 2033146 | 211253 | 35046 | 36207 | 12231 | 25243 | 1256 | 948 | 
| 2021 | 5344868 | 2471985 | 682615 | 103883 | 17060 | 18889 | 6301 | 15615 | 857 |