| Table 3. Estimated stock numbers at age. | |||||||||
| Year Age | 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 |
| 1978 | 29765677 | 8718563 | 1777865 | 813383 | 234128 | 20149 | 14417 | 4675 | 2441 |
| 1979 | 20808769 | 9659984 | 2255805 | 647318 | 279882 | 73517 | 6537 | 4841 | 3476 |
| 1980 | 11134843 | 6577798 | 2357076 | 787408 | 208362 | 91752 | 22456 | 2441 | 4677 |
| 1981 | 10106812 | 3245160 | 1910397 | 835238 | 240234 | 57733 | 22409 | 7290 | 3588 |
| 1982 | 8602173 | 3048736 | 823893 | 782541 | 274233 | 66433 | 14413 | 6421 | 5259 |
| 1983 | 12258244 | 2490368 | 753937 | 330811 | 306081 | 97233 | 19822 | 5103 | 6901 |
| 1984 | 11383827 | 3781654 | 584558 | 284065 | 106914 | 99913 | 28698 | 7196 | 6703 |
| 1985 | 18976936 | 3271963 | 964713 | 219271 | 84736 | 28930 | 28112 | 8472 | 7000 |
| 1986 | 17390975 | 6113589 | 858199 | 413411 | 81273 | 26849 | 7204 | 8737 | 6502 |
| 1987 | 15436176 | 5342471 | 1571556 | 309932 | 146668 | 21351 | 6830 | 2089 | 6391 |
| 1988 | 19582898 | 4636251 | 1663960 | 574076 | 98852 | 40017 | 4779 | 1799 | 3634 |
| 1989 | 11971740 | 6341913 | 1114106 | 643894 | 197225 | 30785 | 11685 | 1778 | 3651 |
| 1990 | 11675745 | 3505525 | 1989529 | 423779 | 237681 | 64647 | 7992 | 4325 | 3115 |
| 1991 | 13625957 | 3396781 | 901265 | 740944 | 139850 | 79470 | 23030 | 3495 | 4470 |
| 1992 | 15591003 | 3945873 | 981552 | 346234 | 318324 | 45461 | 27403 | 12792 | 4155 |
| 1993 | 15848451 | 4382731 | 998043 | 402474 | 145881 | 130442 | 16286 | 11624 | 10675 |
| 1994 | 14485713 | 4314594 | 1150326 | 375312 | 143321 | 54278 | 50364 | 7232 | 10883 |
| 1995 | 10926569 | 3762354 | 1178392 | 471760 | 136575 | 49962 | 18904 | 22496 | 9843 |
| 1996 | 9086453 | 2516458 | 976258 | 497639 | 192325 | 52396 | 19520 | 8467 | 19431 |
| 1997 | 14260478 | 1997812 | 624246 | 438313 | 195499 | 80754 | 21454 | 9037 | 14950 |
| 1998 | 24318015 | 3075832 | 515345 | 268825 | 185599 | 83372 | 36643 | 11415 | 14032 |
| 1999 | 24472452 | 5056467 | 803155 | 222703 | 136799 | 81972 | 39939 | 17333 | 14482 |
| 2000 | 18454813 | 4524962 | 1305989 | 332500 | 102144 | 59425 | 37148 | 21287 | 19125 |
| 2001 | 16123364 | 3212548 | 1290914 | 528079 | 141096 | 42915 | 27475 | 17285 | 24116 |
| 2002 | 9103579 | 2675256 | 900254 | 687345 | 257225 | 63374 | 17993 | 14136 | 20587 |
| 2003 | 8359509 | 1359824 | 712603 | 468816 | 365879 | 125975 | 31586 | 8816 | 18897 |
| 2004 | 8832049 | 1211779 | 300113 | 305999 | 247657 | 176220 | 74402 | 18042 | 15280 |
| 2005 | 9129725 | 1244253 | 314593 | 126389 | 155437 | 131821 | 92434 | 40778 | 20644 |
| 2006 | 6946765 | 1293073 | 344047 | 134622 | 62719 | 85047 | 74758 | 47592 | 34999 |
| 2007 | 10073992 | 887228 | 335508 | 164580 | 60528 | 31038 | 46026 | 38545 | 49169 |
| 2008 | 10278195 | 1339228 | 246977 | 155700 | 79824 | 28595 | 14869 | 23936 | 52014 |
| 2009 | 10058311 | 1391387 | 353265 | 102759 | 68899 | 40991 | 14629 | 7842 | 42657 |
| 2010 | 9953891 | 1320900 | 413633 | 149195 | 50630 | 35478 | 20158 | 6804 | 28256 |
| 2011 | 7056704 | 1334914 | 429269 | 190509 | 73064 | 24924 | 15215 | 8671 | 19271 |
| 2012 | 5952575 | 920117 | 431527 | 185161 | 95399 | 38434 | 11762 | 7075 | 17506 |
| 2013 | 10372010 | 726185 | 244576 | 219459 | 96894 | 44081 | 17648 | 5426 | 14800 |
| 2014 | 12614745 | 1398486 | 236989 | 123677 | 115200 | 47658 | 19931 | 8922 | 13265 |
| 2015 | 10944262 | 1637307 | 472299 | 101832 | 62067 | 57618 | 21430 | 9443 | 13796 |
| 2016 | 12603628 | 1441180 | 491875 | 198614 | 48744 | 29223 | 24933 | 10536 | 13473 |
| 2017 | 8070597 | 1827205 | 477190 | 194779 | 82139 | 22779 | 11872 | 12089 | 13527 |
| 2018 | 11861058 | 1134779 | 589061 | 207804 | 87299 | 35118 | 9632 | 5987 | 12211 |
| 2019 | 22679024 | 1859624 | 383005 | 266674 | 102018 | 38233 | 14896 | 5351 | 8906 |
| 2020 | 20836426 | 3974045 | 575861 | 196158 | 130796 | 46254 | 17763 | 7291 | 6583 |
| 2021 | 9703291 | 3859884 | 1425233 | 260139 | 103844 | 60533 | 23850 | 10539 | 6755 |
| 2022 | 12086624 | 1646076 | 1366654 | 741193 | 137446 | 53920 | 32519 | 14177 | 11404 |
| 2023 | 8794481 | 2461596 | 635830 | 715520 | 432069 | 71153 | 28132 | 21621 | 16731 |
| 2024 | 14690401 | 1607162 | 814770 | 342280 | 464919 | 256787 | 37403 | 16471 | 25644 |
| 2025 | 14690401 | 2909669 | 579054 | 402778 | 190080 | 263689 | 150461 | 24732 | 30142 |