| Table 3. Estimated stock numbers at age. | |||||
| Year Age | 0 | 1 | 2 | 3 | 4 |
| 2005 | 2524 | 1677 | 463 | 46 | 36 |
| 2006 | 2436 | 1067 | 453 | 71 | 29 |
| 2007 | 2325 | 1028 | 309 | 66 | 32 |
| 2008 | 2263 | 980 | 293 | 40 | 27 |
| 2009 | 2176 | 952 | 288 | 36 | 18 |
| 2010 | 1948 | 914 | 308 | 41 | 17 |
| 2011 | 1708 | 819 | 319 | 56 | 19 |
| 2012 | 1622 | 720 | 321 | 72 | 24 |
| 2013 | 1538 | 684 | 297 | 82 | 32 |
| 2014 | 1461 | 648 | 280 | 73 | 35 |
| 2015 | 1415 | 616 | 257 | 67 | 32 |
| 2016 | 1373 | 595 | 234 | 60 | 28 |
| 2017 | 1333 | 577 | 224 | 58 | 27 |
| 2018 | 1451 | 561 | 230 | 66 | 31 |
| 2019 | 1549 | 609 | 234 | 80 | 43 |
| 2020 | 1601 | 649 | 273 | 96 | 61 |
| 2021 | 1612 | 668 | 308 | 130 | 83 |