| Table 3. Estimated stock numbers at age. | |||||||||
| Year Age | 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 |
| 1991 | 80852767 | 16816003 | 5983850 | 4125036 | 1719301 | 956786 | 276913 | 78249 | 26492 |
| 1992 | 48706688 | 14879279 | 5474374 | 2704474 | 1876131 | 786681 | 449942 | 135688 | 52680 |
| 1993 | 43429237 | 8997015 | 4845271 | 2394823 | 1227254 | 811044 | 326176 | 175487 | 68349 |
| 1994 | 66964202 | 7903787 | 2897931 | 2144912 | 1027035 | 528976 | 326426 | 123307 | 86066 |
| 1995 | 55340742 | 12318298 | 2557965 | 1229963 | 906127 | 394933 | 203475 | 112785 | 69522 |
| 1996 | 67165549 | 10146359 | 3783990 | 1054985 | 515121 | 372112 | 165229 | 82024 | 72204 |
| 1997 | 57240410 | 12499213 | 3179036 | 1643019 | 428083 | 196345 | 132885 | 57304 | 54993 |
| 1998 | 85565116 | 10559462 | 4065402 | 1432040 | 719737 | 184769 | 83266 | 48671 | 39081 |
| 1999 | 91947493 | 15962768 | 3429664 | 1793030 | 650544 | 308713 | 77608 | 33961 | 30948 |
| 2000 | 53154716 | 17153016 | 5277721 | 1548652 | 811074 | 311126 | 141419 | 35728 | 28680 |
| 2001 | 60127431 | 9798534 | 5565745 | 2356811 | 688498 | 343891 | 131858 | 55828 | 22376 |
| 2002 | 55392101 | 11055685 | 3199389 | 2552757 | 1096909 | 293128 | 143501 | 50609 | 28629 |
| 2003 | 62685615 | 10155071 | 3632539 | 1446558 | 1183583 | 494731 | 127884 | 60680 | 32825 |
| 2004 | 40400394 | 11645100 | 3406153 | 1712627 | 699180 | 541575 | 223850 | 56522 | 40212 |
| 2005 | 41159378 | 7390922 | 3986114 | 1635643 | 822642 | 331253 | 249652 | 99047 | 41371 |
| 2006 | 29866484 | 7534743 | 2467123 | 1833009 | 785143 | 369650 | 147187 | 101114 | 53940 |
| 2007 | 34693085 | 5422308 | 2506003 | 1130032 | 841853 | 363930 | 153573 | 62717 | 62050 |
| 2008 | 29857173 | 6405214 | 1788733 | 1120329 | 527214 | 383846 | 171723 | 66432 | 54561 |
| 2009 | 25917279 | 5483991 | 2167029 | 815064 | 503689 | 242665 | 165483 | 74804 | 51591 |
| 2010 | 42376318 | 4726918 | 1821696 | 968784 | 394176 | 232934 | 114551 | 70586 | 55469 |
| 2011 | 29831854 | 7854912 | 1597338 | 824693 | 487413 | 198645 | 117174 | 59228 | 63404 |
| 2012 | 24690274 | 5492704 | 2702830 | 800672 | 414135 | 247761 | 101107 | 56840 | 64411 |
| 2013 | 39664038 | 4553541 | 1862524 | 1292697 | 405124 | 200448 | 122403 | 49175 | 57772 |
| 2014 | 26042611 | 7392409 | 1544147 | 878903 | 625420 | 188137 | 94416 | 57169 | 50341 |
| 2015 | 18119082 | 4779411 | 2592360 | 755593 | 447091 | 290569 | 95297 | 46689 | 55277 |
| 2016 | 21210234 | 3284774 | 1629740 | 1270889 | 380979 | 221229 | 136107 | 44689 | 47438 |
| 2017 | 19271795 | 3884630 | 1084248 | 714676 | 619505 | 183253 | 104105 | 56502 | 37012 |
| 2018 | 15869319 | 3546489 | 1307420 | 488960 | 324981 | 296822 | 81783 | 40943 | 33775 |
| 2019 | 17311426 | 2942913 | 1180424 | 551305 | 236558 | 155255 | 136345 | 35379 | 31728 |
| 2020 | 11328691 | 3214150 | 1015858 | 528313 | 273444 | 122465 | 79223 | 66050 | 33293 |
| 2021 | 7016991 | 2108412 | 1108572 | 491927 | 266646 | 138526 | 63106 | 36989 | 47709 |
| 2022 | 19222977 | 1273960 | 748064 | 508800 | 261242 | 137875 | 77131 | 34823 | 46966 |
| 2023 | 9419840 | 3579891 | 445860 | 394397 | 272487 | 145200 | 75086 | 44849 | 46726 |
| 2024 | 11414796 | 1736823 | 1254873 | 228428 | 218307 | 154335 | 86544 | 43919 | 56211 |