| Table 3. Estimated stock numbers at age. | ||||||||
| Year Age | 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 |
| 1999 | 1987943 | 294711 | 98717 | 33088 | 18172 | 14729 | 12580 | 2457 |
| 2000 | 1878001 | 586183 | 114533 | 34425 | 10291 | 4664 | 3263 | 2860 |
| 2001 | 1327609 | 551966 | 231216 | 40944 | 11083 | 2470 | 883 | 776 |
| 2002 | 1171171 | 386398 | 217369 | 86470 | 13913 | 2673 | 336 | 93 |
| 2003 | 924320 | 344390 | 152996 | 87671 | 34970 | 4270 | 483 | 11 |
| 2004 | 1012249 | 268541 | 132646 | 57384 | 36821 | 13346 | 1240 | 78 |
| 2005 | 668130 | 285833 | 95698 | 38799 | 17950 | 12686 | 3985 | 232 |
| 2006 | 805832 | 194499 | 100180 | 27402 | 10991 | 5454 | 3898 | 892 |
| 2007 | 884754 | 233195 | 73589 | 35113 | 8741 | 3249 | 1327 | 840 |
| 2008 | 1139762 | 260959 | 90585 | 25233 | 8476 | 1723 | 448 | 195 |
| 2009 | 1482557 | 334465 | 104812 | 35557 | 8187 | 2407 | 443 | 146 |
| 2010 | 579153 | 441035 | 136518 | 44501 | 12932 | 2542 | 654 | 152 |
| 2011 | 657178 | 171824 | 180922 | 59117 | 17105 | 4221 | 730 | 211 |
| 2012 | 656704 | 194617 | 70753 | 81845 | 25690 | 6419 | 1384 | 276 |
| 2013 | 1379236 | 190818 | 78828 | 31161 | 35888 | 10009 | 2117 | 490 |
| 2014 | 481710 | 414655 | 77746 | 35908 | 14279 | 14568 | 3330 | 716 |
| 2015 | 545102 | 143790 | 170661 | 34843 | 16075 | 5563 | 4869 | 1146 |
| 2016 | 330146 | 158332 | 57410 | 69004 | 13367 | 5347 | 1561 | 1405 |
| 2017 | 278699 | 95111 | 60019 | 20955 | 22466 | 3586 | 1151 | 472 |
| 2018 | 464766 | 80527 | 36962 | 21762 | 6816 | 6157 | 784 | 269 |
| 2019 | 341088 | 136676 | 31345 | 12648 | 5785 | 1472 | 1030 | 122 |
| 2020 | 404563 | 100603 | 55427 | 12532 | 4024 | 1305 | 261 | 160 |
| 2021 | 254353 | 118327 | 40297 | 21205 | 3804 | 835 | 174 | 45 |
| 2022 | 94655 | 76278 | 47348 | 16728 | 7672 | 1021 | 165 | 34 |
| 2023 | 96963 | 27663 | 30508 | 18553 | 6280 | 2367 | 291 | 63 |
| 2024 | 120359 | 28865 | 11298 | 13429 | 8427 | 2625 | 909 | 146 |
| 2025 | 223357 | 35523 | 11284 | 4360 | 6011 | 4036 | 1322 | 576 |