| Table 3. Estimated stock numbers at age. | ||||||||
| Year Age | 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 |
| 1999 | 1723815 | 289032 | 99708 | 37990 | 17104 | 14928 | 9747 | 2524 |
| 2000 | 1536909 | 541449 | 110203 | 33153 | 11918 | 4389 | 2954 | 1815 |
| 2001 | 1404096 | 443820 | 220813 | 39134 | 9744 | 2952 | 925 | 592 |
| 2002 | 1268734 | 409073 | 169175 | 88077 | 13997 | 2016 | 391 | 95 |
| 2003 | 1079293 | 385337 | 163341 | 63314 | 38299 | 4598 | 514 | 46 |
| 2004 | 913229 | 318329 | 155178 | 67393 | 34933 | 13825 | 912 | 78 |
| 2005 | 850721 | 233106 | 118979 | 40834 | 18227 | 13858 | 4117 | 182 |
| 2006 | 893762 | 246624 | 67383 | 30068 | 10952 | 5075 | 5724 | 807 |
| 2007 | 983143 | 241606 | 96074 | 37518 | 10129 | 3513 | 1078 | 945 |
| 2008 | 1054371 | 297062 | 83920 | 28981 | 7935 | 1615 | 366 | 146 |
| 2009 | 1023800 | 323730 | 117798 | 31889 | 8818 | 2289 | 409 | 103 |
| 2010 | 707497 | 343536 | 128780 | 50378 | 11592 | 2540 | 532 | 109 |
| 2011 | 667723 | 197725 | 150683 | 55044 | 18444 | 3773 | 744 | 163 |
| 2012 | 664951 | 194253 | 82096 | 74460 | 24008 | 6409 | 1239 | 258 |
| 2013 | 898057 | 164666 | 79237 | 36174 | 37074 | 10455 | 2071 | 444 |
| 2014 | 575183 | 351252 | 61136 | 34873 | 17398 | 16165 | 3276 | 681 |
| 2015 | 537786 | 160709 | 182558 | 27576 | 15376 | 5845 | 5250 | 1022 |
| 2016 | 418740 | 156341 | 62429 | 82479 | 11906 | 5293 | 1627 | 1407 |
| 2017 | 381527 | 106949 | 56518 | 21092 | 24375 | 3447 | 1159 | 490 |
| 2018 | 515719 | 90916 | 37555 | 19112 | 6917 | 6307 | 786 | 270 |
| 2019 | 507838 | 161846 | 30544 | 11548 | 5535 | 1621 | 1064 | 127 |
| 2020 | 651087 | 142314 | 63799 | 11661 | 3092 | 1194 | 303 | 157 |
| 2021 | 702039 | 197665 | 58320 | 28890 | 3849 | 730 | 195 | 58 |
| 2022 | 707071 | 230708 | 81419 | 27482 | 11246 | 1162 | 150 | 44 |
| 2023 | 697699 | 238598 | 109146 | 34868 | 13014 | 4142 | 369 | 59 |