| Table 3. Estimated stock numbers at age. | |||||||||
| Year Age | 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 |
| 1991 | 81363529 | 16697427 | 6020107 | 4117578 | 1714311 | 953939 | 277330 | 78633 | 26583 |
| 1992 | 47777669 | 14968979 | 5441627 | 2722420 | 1879872 | 787187 | 448952 | 135458 | 52502 |
| 1993 | 43086991 | 8843336 | 4865745 | 2384450 | 1230450 | 812627 | 326557 | 175291 | 68305 |
| 1994 | 67101433 | 7880640 | 2856592 | 2147365 | 1025731 | 527878 | 327367 | 123406 | 86150 |
| 1995 | 55714513 | 12331679 | 2537361 | 1216566 | 903864 | 396687 | 202582 | 113439 | 69811 |
| 1996 | 67434500 | 10216696 | 3804065 | 1050244 | 510755 | 370618 | 165229 | 81477 | 72717 |
| 1997 | 57471037 | 12501058 | 3208473 | 1643087 | 428505 | 195854 | 133204 | 57237 | 54560 |
| 1998 | 87279745 | 10596205 | 4055698 | 1443369 | 721115 | 184763 | 82694 | 49144 | 38975 |
| 1999 | 93051179 | 16206406 | 3434252 | 1790111 | 654579 | 310071 | 77749 | 33573 | 31420 |
| 2000 | 53523135 | 17277417 | 5339137 | 1551066 | 814768 | 311309 | 142601 | 35764 | 28725 |
| 2001 | 60536195 | 9865720 | 5593509 | 2377785 | 689762 | 346385 | 131624 | 56171 | 22557 |
| 2002 | 55897112 | 11126844 | 3221897 | 2551041 | 1100623 | 294603 | 144579 | 50790 | 28930 |
| 2003 | 62899683 | 10265878 | 3658502 | 1461411 | 1180846 | 494768 | 128591 | 61180 | 33110 |
| 2004 | 40261770 | 11661752 | 3452071 | 1720416 | 704302 | 541664 | 223904 | 56767 | 40583 |
| 2005 | 40631196 | 7386307 | 3977729 | 1658120 | 826985 | 333249 | 249750 | 99120 | 41660 |
| 2006 | 29590030 | 7457726 | 2470754 | 1830770 | 794305 | 371109 | 147543 | 101544 | 54303 |
| 2007 | 34410289 | 5400800 | 2489679 | 1133645 | 843549 | 366549 | 155896 | 62599 | 62555 |
| 2008 | 29066817 | 6364237 | 1793799 | 1121863 | 530161 | 385840 | 171785 | 67816 | 54651 |
| 2009 | 25628360 | 5353194 | 2153321 | 819342 | 507691 | 244464 | 167771 | 74759 | 52326 |
| 2010 | 42007942 | 4694926 | 1785493 | 968154 | 393189 | 235133 | 114927 | 72266 | 55919 |
| 2011 | 29531231 | 7780345 | 1591157 | 818856 | 486161 | 198301 | 118287 | 59052 | 64784 |
| 2012 | 24720521 | 5445680 | 2676738 | 792934 | 413369 | 248129 | 101220 | 57904 | 64665 |
| 2013 | 39726240 | 4568657 | 1854053 | 1279654 | 399837 | 200676 | 122464 | 49142 | 58725 |
| 2014 | 24997154 | 7394939 | 1555731 | 878452 | 619515 | 186547 | 94502 | 57095 | 50783 |
| 2015 | 17272380 | 4599670 | 2582775 | 760666 | 445924 | 291390 | 94194 | 46729 | 55148 |
| 2016 | 19982621 | 3149594 | 1568905 | 1256154 | 383079 | 219761 | 137009 | 44087 | 47279 |
| 2017 | 18062249 | 3669254 | 1046395 | 687665 | 608402 | 181817 | 102174 | 56722 | 36645 |
| 2018 | 15516970 | 3323853 | 1235540 | 467820 | 314867 | 287380 | 80020 | 39757 | 33711 |
| 2019 | 16775046 | 2865505 | 1108578 | 520387 | 224468 | 149022 | 130548 | 34035 | 30914 |
| 2020 | 11424835 | 3093699 | 983881 | 498113 | 258530 | 115464 | 75207 | 62461 | 31735 |
| 2021 | 7719657 | 2109682 | 1061043 | 471712 | 251349 | 130884 | 58850 | 34781 | 44592 |
| 2022 | 21626611 | 1402741 | 739438 | 490857 | 248304 | 130288 | 72052 | 31971 | 43512 |
| 2023 | 10664477 | 3999746 | 490085 | 382767 | 261942 | 138610 | 71827 | 41591 | 43196 |
| 2024 | 23545624 | 1959564 | 1398638 | 252407 | 207789 | 147738 | 82606 | 42262 | 52282 |
| 2025 | 20038259 | 4376993 | 682679 | 698708 | 138916 | 114204 | 84898 | 48798 | 58737 |