| Table 3. Estimated stock numbers at age. | |||||||
| Year Age | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 
| 1998 | 2610043 | 386451 | 1445571 | 1182398 | 85623 | 77742 | 256735 | 
| 1999 | 3813665 | 2095480 | 311219 | 941158 | 595037 | 36592 | 66465 | 
| 2000 | 5198839 | 3132922 | 1542507 | 185246 | 380260 | 219004 | 16491 | 
| 2001 | 5104839 | 4785300 | 2304894 | 830879 | 59194 | 104627 | 24312 | 
| 2002 | 4855025 | 4159205 | 4057284 | 1166226 | 235680 | 9969 | 4163 | 
| 2003 | 5986757 | 2966868 | 2915851 | 2685696 | 496605 | 90869 | 789 | 
| 2004 | 6193613 | 5648403 | 1733549 | 1752272 | 1299933 | 160741 | 9744 | 
| 2005 | 5124062 | 5822031 | 4962060 | 737054 | 620089 | 348814 | 4975 | 
| 2006 | 5273690 | 3470799 | 3793224 | 2382566 | 280853 | 205132 | 38486 | 
| 2007 | 4853517 | 4070063 | 1598943 | 1457613 | 918518 | 119938 | 57106 | 
| 2008 | 6107435 | 3331957 | 2676725 | 713565 | 443982 | 347260 | 47296 | 
| 2009 | 6142336 | 6485379 | 2109989 | 1585416 | 207991 | 182785 | 115648 | 
| 2010 | 6620297 | 3869405 | 4745312 | 1487756 | 692290 | 96409 | 117639 | 
| 2011 | 9451050 | 3954065 | 2085114 | 2005489 | 639032 | 322734 | 89110 | 
| 2012 | 12788475 | 6753361 | 2490551 | 454182 | 533651 | 245619 | 150287 | 
| 2013 | 14261502 | 11702113 | 4451857 | 704205 | 163035 | 190506 | 161686 | 
| 2014 | 12952265 | 11341573 | 6922875 | 1819583 | 220211 | 81163 | 167777 | 
| 2015 | 8708700 | 10523493 | 7064138 | 3901879 | 636291 | 100798 | 135484 | 
| 2016 | 5925320 | 6686369 | 6405251 | 3844877 | 1756016 | 332795 | 132899 | 
| 2017 | 3993805 | 5277202 | 4154053 | 3149436 | 1647637 | 820738 | 242225 | 
| 2018 | 2940774 | 3584564 | 3363422 | 1618286 | 1296451 | 739762 | 514761 | 
| 2019 | 2274878 | 2933985 | 2053504 | 1109208 | 547370 | 538471 | 624436 | 
| 2020 | 1733256 | 1814860 | 1987182 | 745494 | 243840 | 184541 | 503644 |