| Table 2. Estimated stock numbers. | |||||||||
| Year\Age | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9+ |
| 2002 | 133920 | 72114 | 49415 | 43045 | 30730 | 21888 | 12958 | 7019 | 8260 |
| 2003 | 67104 | 95607 | 55050 | 33456 | 28311 | 22675 | 15579 | 9650 | 11926 |
| 2004 | 39379 | 37911 | 56727 | 42830 | 29496 | 22857 | 16632 | 11263 | 18656 |
| 2005 | 31825 | 32598 | 30303 | 40538 | 31540 | 23861 | 18303 | 12162 | 22994 |
| 2006 | 60476 | 42574 | 36975 | 32630 | 38254 | 30638 | 24392 | 18466 | 29525 |
| 2007 | 138275 | 64023 | 46537 | 37384 | 32016 | 31761 | 23318 | 19756 | 31195 |
| 2008 | 117712 | 92967 | 55659 | 43045 | 35668 | 30455 | 27806 | 17175 | 31101 |
| 2009 | 148153 | 90762 | 71970 | 49464 | 36791 | 29349 | 26635 | 26344 | 27228 |
| 2010 | 125869 | 115960 | 79778 | 63259 | 46444 | 35419 | 22925 | 19622 | 32696 |
| 2011 | 200186 | 107904 | 91491 | 65710 | 51586 | 41898 | 33456 | 17627 | 29852 |
| 2012 | 273484 | 167042 | 89501 | 77497 | 58105 | 39183 | 36026 | 30915 | 18809 |
| 2013 | 451802 | 245242 | 131795 | 59278 | 50665 | 37609 | 21024 | 25034 | 16496 |
| 2014 | 300139 | 319336 | 202602 | 87116 | 31257 | 29555 | 28653 | 16360 | 21969 |
| 2015 | 121540 | 255506 | 196025 | 123748 | 59101 | 22315 | 26213 | 28510 | 24005 |