| Table 3. Estimated stock numbers at age. | |||||||||
| Year Age | 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 |
| 1960 | 13470846 | 20918233 | 6116418 | 14686437 | 1335687 | 1478290 | 648664 | 622104 | 1271385 |
| 1961 | 76366823 | 4932964 | 8825182 | 3036081 | 8668886 | 811382 | 947687 | 366510 | 982304 |
| 1962 | 30867875 | 35010506 | 2181942 | 3892276 | 1692950 | 5035534 | 483307 | 584143 | 786388 |
| 1963 | 46185162 | 14758049 | 18239618 | 1239437 | 1722606 | 912419 | 2648632 | 238370 | 753558 |
| 1964 | 43032780 | 19285330 | 7157943 | 10207612 | 753443 | 951348 | 595734 | 1719210 | 599690 |
| 1965 | 18080009 | 19781880 | 7151651 | 3584199 | 5420400 | 428533 | 510082 | 360744 | 1474289 |
| 1966 | 22255101 | 8572745 | 8345155 | 2476650 | 1487243 | 2318618 | 193917 | 223646 | 893884 |
| 1967 | 29709704 | 9027939 | 3774016 | 3464537 | 918753 | 691147 | 932557 | 102217 | 494623 |
| 1968 | 29489204 | 12203404 | 3290310 | 1597987 | 1235895 | 311338 | 260489 | 293026 | 178128 |
| 1969 | 12195687 | 12629656 | 4486324 | 759407 | 304397 | 360422 | 80049 | 65714 | 105088 |
| 1970 | 29641545 | 5791249 | 4721455 | 1596058 | 227203 | 94925 | 118197 | 17222 | 45397 |
| 1971 | 21499787 | 12730490 | 2399230 | 1395911 | 416543 | 63405 | 26369 | 28511 | 17814 |
| 1972 | 15998634 | 9608252 | 3747350 | 772042 | 337193 | 105332 | 15142 | 1352 | 6981 |
| 1973 | 6900537 | 6519835 | 3006514 | 1218563 | 301559 | 136044 | 49174 | 7388 | 4594 |
| 1974 | 13287476 | 2820461 | 1784834 | 829663 | 297851 | 101864 | 44204 | 13233 | 5131 |
| 1975 | 2716932 | 6025978 | 878268 | 504406 | 244221 | 93209 | 32079 | 13333 | 6493 |
| 1976 | 2799549 | 917150 | 1711160 | 198743 | 100426 | 59864 | 20484 | 8743 | 3955 |
| 1977 | 5779548 | 1022465 | 353021 | 535488 | 44733 | 30006 | 18912 | 9018 | 4518 |
| 1978 | 6418724 | 2756609 | 366611 | 231449 | 196064 | 19961 | 15362 | 9033 | 9359 |
| 1979 | 10519798 | 2731129 | 1104601 | 265848 | 212868 | 107611 | 14288 | 11378 | 12141 |
| 1980 | 15413660 | 4037366 | 1114098 | 634235 | 216166 | 186180 | 71635 | 12528 | 12364 |
| 1981 | 36817410 | 5940361 | 1873782 | 503183 | 313060 | 144050 | 130404 | 56653 | 19316 |
| 1982 | 60062522 | 10394644 | 2286313 | 1082023 | 265859 | 173705 | 83558 | 77154 | 40053 |
| 1983 | 60853182 | 18727030 | 3931511 | 1264789 | 566178 | 159134 | 122157 | 56390 | 83920 |
| 1984 | 57096786 | 17191672 | 7143063 | 2051096 | 721652 | 296582 | 94906 | 76059 | 82973 |
| 1985 | 61309729 | 18706890 | 6689073 | 3761413 | 1059390 | 372935 | 140766 | 52949 | 79376 |
| 1986 | 68635203 | 24477942 | 6458301 | 3317849 | 1691206 | 468369 | 174964 | 62407 | 62747 |
| 1987 | 78227167 | 28487089 | 9604118 | 2974872 | 1648868 | 801904 | 230665 | 80437 | 53881 |
| 1988 | 40275204 | 27192112 | 10863224 | 4852708 | 1439959 | 812495 | 381816 | 113285 | 66542 |
| 1989 | 37222234 | 14301036 | 8363529 | 6023421 | 2654276 | 706817 | 390493 | 175377 | 86057 |
| 1990 | 27057854 | 13566658 | 5100946 | 4387065 | 3763175 | 1490213 | 370392 | 206084 | 134376 |
| 1991 | 30217548 | 11308523 | 4742333 | 2622342 | 2507989 | 2190154 | 817727 | 207511 | 180303 |
| 1992 | 56964886 | 10970336 | 4867642 | 2099673 | 1462808 | 1394501 | 1270413 | 477613 | 222248 |
| 1993 | 50525926 | 17692017 | 4181465 | 2090693 | 1046456 | 757993 | 743459 | 622207 | 370467 |
| 1994 | 39453267 | 14649116 | 6269759 | 1638514 | 816296 | 434884 | 339848 | 332378 | 446294 |
| 1995 | 57259807 | 13210348 | 6399092 | 2813830 | 787840 | 333784 | 196835 | 157056 | 359073 |
| 1996 | 46918344 | 19144847 | 5848571 | 3156933 | 1213978 | 347524 | 125059 | 84977 | 221354 |
| 1997 | 28864763 | 17787727 | 7918830 | 3178546 | 1680051 | 670133 | 203397 | 67076 | 179440 |
| 1998 | 21654641 | 12621150 | 9853257 | 3653591 | 1623844 | 863362 | 386499 | 122603 | 138924 |
| 1999 | 83299032 | 9926011 | 5929031 | 5920811 | 1798789 | 764626 | 408443 | 183573 | 130626 |
| 2000 | 50409456 | 34915185 | 5728940 | 3241704 | 3422866 | 996597 | 434445 | 241218 | 165634 |
| 2001 | 91131897 | 17886495 | 15345316 | 3522602 | 1794885 | 1791163 | 504443 | 230788 | 214501 |
| 2002 | 51493951 | 43375870 | 8956199 | 9599891 | 1968493 | 996644 | 1023792 | 279100 | 268540 |
| 2003 | 26071649 | 19357197 | 22296481 | 4984862 | 5460121 | 999113 | 577178 | 591103 | 295513 |
| 2004 | 36496863 | 9895812 | 7609644 | 12765216 | 3062228 | 3094792 | 498148 | 352103 | 461895 |
| 2005 | 29919263 | 12369948 | 4274326 | 4273534 | 7220811 | 1675532 | 1612513 | 241474 | 422840 |
| 2006 | 30322644 | 10170413 | 5821801 | 2641702 | 2494579 | 4125513 | 798329 | 731406 | 300208 |
| 2007 | 31773520 | 10130799 | 4118748 | 3217804 | 1589891 | 1348373 | 2203712 | 387881 | 514534 |
| 2008 | 29695869 | 10157682 | 4795816 | 2305730 | 1838588 | 951362 | 788780 | 1369355 | 502007 |
| 2009 | 53035608 | 10793323 | 6088662 | 2839239 | 1406269 | 1136605 | 617754 | 535120 | 1225519 |
| 2010 | 38539157 | 19621869 | 6142386 | 4111396 | 1997983 | 999511 | 896545 | 465970 | 1212827 |
| 2011 | 33965441 | 13901321 | 8297232 | 3833220 | 2595577 | 1221837 | 635769 | 591104 | 1130398 |
| 2012 | 33841621 | 11835435 | 6877591 | 5297755 | 2606804 | 1649384 | 784346 | 385550 | 1115876 |
| 2013 | 43529168 | 13470716 | 5429276 | 4644500 | 3619771 | 1886120 | 1113278 | 491005 | 929834 |
| 2014 | 68057054 | 20114982 | 6728286 | 3510013 | 3413929 | 2226769 | 1211339 | 674260 | 741976 |
| 2015 | 21541166 | 23438591 | 12087377 | 3627613 | 2124482 | 2016377 | 1265104 | 681773 | 774303 |
| 2016 | 31486446 | 8298907 | 13783139 | 7740149 | 2056421 | 1170545 | 1072008 | 617843 | 659025 |
| 2017 | 18851838 | 10394680 | 3212764 | 8566914 | 4749583 | 1133418 | 517760 | 436561 | 451137 |