| Table 3. Estimated stock numbers at age. | |||||||
| Year Age | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 
| 1999 | 67054 | 34745 | 11526 | 5382 | 3291 | 321 | 1026 | 
| 2000 | 54643 | 53847 | 21909 | 4808 | 1755 | 1103 | 480 | 
| 2001 | 26578 | 43651 | 34149 | 9024 | 1440 | 585 | 540 | 
| 2002 | 36322 | 19868 | 27130 | 15253 | 2591 | 469 | 373 | 
| 2003 | 22206 | 28179 | 11867 | 11240 | 4940 | 829 | 287 | 
| 2004 | 27091 | 16871 | 16548 | 5545 | 3761 | 1848 | 419 | 
| 2005 | 21999 | 22054 | 11104 | 7233 | 1966 | 1452 | 901 | 
| 2006 | 18508 | 17004 | 14797 | 5461 | 2642 | 760 | 964 | 
| 2007 | 19516 | 15032 | 11189 | 6759 | 1936 | 962 | 666 | 
| 2008 | 19178 | 15815 | 10220 | 5305 | 2271 | 728 | 649 | 
| 2009 | 21913 | 14686 | 10221 | 4822 | 1818 | 817 | 541 | 
| 2010 | 27354 | 17362 | 9369 | 4626 | 1782 | 671 | 563 | 
| 2011 | 33452 | 21766 | 11628 | 4438 | 1693 | 711 | 543 | 
| 2012 | 26960 | 25753 | 14359 | 5981 | 1690 | 651 | 544 | 
| 2013 | 23463 | 20531 | 18290 | 8028 | 2940 | 804 | 597 | 
| 2014 | 26285 | 18504 | 14724 | 10690 | 4226 | 1511 | 748 | 
| 2015 | 27112 | 21506 | 13766 | 9041 | 5631 | 2302 | 1265 | 
| 2016 | 38651 | 22174 | 16506 | 8718 | 4867 | 3045 | 2017 | 
| 2017 | 60856 | 30216 | 16865 | 10550 | 4727 | 2600 | 2877 | 
| 2018 | 46838 | 48211 | 23697 | 10743 | 6316 | 2612 | 3218 | 
| 2019 | 35561 | 36628 | 37327 | 16707 | 6144 | 3806 | 3554 | 
| 2020 | 64699 | 28415 | 27613 | 26222 | 10905 | 3797 | 4632 |