| Table 3. Estimated stock numbers at age. | |||||
| Year Age | 0 | 1 | 2 | 3 | 4 | 
| 2005 | 3212 | 1781 | 450 | 52 | 39 | 
| 2006 | 3138 | 1363 | 473 | 76 | 39 | 
| 2007 | 2687 | 1329 | 428 | 79 | 42 | 
| 2008 | 2607 | 1136 | 353 | 43 | 27 | 
| 2009 | 2362 | 1095 | 286 | 33 | 15 | 
| 2010 | 1776 | 985 | 324 | 40 | 16 | 
| 2011 | 1505 | 741 | 294 | 60 | 20 | 
| 2012 | 1693 | 636 | 323 | 76 | 28 | 
| 2013 | 1697 | 716 | 295 | 97 | 37 | 
| 2014 | 1610 | 718 | 308 | 65 | 38 | 
| 2015 | 1584 | 680 | 302 | 73 | 28 | 
| 2016 | 1551 | 666 | 257 | 65 | 23 | 
| 2017 | 1408 | 648 | 239 | 61 | 22 | 
| 2018 | 1483 | 596 | 318 | 96 | 31 | 
| 2019 | 1992 | 623 | 280 | 154 | 71 | 
| 2020 | 2422 | 831 | 300 | 148 | 134 |