| Table 2. Estimated stock numbers. | |||||||
| Year\Age | 2 | 3 | 4 | 5 | 6 | 7 | 8+ |
| 2005 | 15036633 | 12877601 | 8788899 | 3741511 | 1088161 | 313013 | 312075 |
| 2006 | 15775994 | 13256519 | 9020407 | 3832393 | 1130307 | 321258 | 318380 |
| 2007 | 16936811 | 14475961 | 9664791 | 4057185 | 1187072 | 345242 | 340102 |
| 2008 | 16701348 | 14374984 | 9664791 | 4045032 | 1171740 | 336381 | 335709 |
| 2009 | 16370639 | 14034091 | 9606975 | 4008790 | 1157763 | 329391 | 329391 |
| 2010 | 17505051 | 14621447 | 9899551 | 4159893 | 1205012 | 343863 | 340783 |
| 2011 | 17575211 | 15325061 | 10355207 | 4377551 | 1278247 | 363669 | 356112 |
| 2012 | 17470075 | 15263883 | 10564396 | 4452606 | 1287226 | 371387 | 368060 |
| 2013 | 17487554 | 14857272 | 10201038 | 4368805 | 1265528 | 356468 | 356112 |
| 2014 | 19115307 | 15902709 | 10596136 | 4439268 | 1288514 | 370645 | 364033 |