| Table 3. Estimated stock numbers at age. | ||||||||
| Year Age | 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 
| 1999 | 1827702 | 284797 | 97030 | 39577 | 18763 | 15704 | 10922 | 2704 | 
| 2000 | 1591622 | 588087 | 115893 | 33535 | 12315 | 4726 | 3222 | 2115 | 
| 2001 | 1236590 | 508585 | 242840 | 41660 | 10428 | 2944 | 914 | 654 | 
| 2002 | 1114610 | 390477 | 209083 | 90998 | 13701 | 2208 | 381 | 92 | 
| 2003 | 876332 | 357275 | 161341 | 84814 | 35647 | 4004 | 437 | 35 | 
| 2004 | 744438 | 279051 | 145338 | 61482 | 37703 | 12290 | 944 | 67 | 
| 2005 | 651056 | 229064 | 104139 | 40142 | 17729 | 13244 | 3399 | 188 | 
| 2006 | 716581 | 207043 | 83953 | 29839 | 11272 | 5199 | 4284 | 728 | 
| 2007 | 878877 | 224084 | 86529 | 35886 | 10546 | 3533 | 1251 | 746 | 
| 2008 | 1051798 | 280808 | 88479 | 28590 | 8129 | 1809 | 425 | 171 | 
| 2009 | 1220946 | 337090 | 117665 | 35377 | 9378 | 2351 | 452 | 126 | 
| 2010 | 617071 | 402561 | 143463 | 50068 | 12413 | 2722 | 583 | 127 | 
| 2011 | 606938 | 198286 | 180085 | 63031 | 19094 | 4020 | 787 | 180 | 
| 2012 | 540716 | 195947 | 86723 | 85398 | 27073 | 6857 | 1283 | 268 | 
| 2013 | 1263780 | 167481 | 85289 | 39758 | 39692 | 10886 | 2338 | 473 | 
| 2014 | 524044 | 427860 | 71596 | 39046 | 17854 | 16135 | 3613 | 815 | 
| 2015 | 538305 | 168155 | 194855 | 33140 | 17252 | 6595 | 5248 | 1211 | 
| 2016 | 367523 | 171644 | 72362 | 84276 | 13404 | 5806 | 1835 | 1461 | 
| 2017 | 286001 | 115264 | 70053 | 27732 | 28212 | 3861 | 1341 | 604 | 
| 2018 | 532010 | 87520 | 47943 | 28173 | 9900 | 8267 | 965 | 390 | 
| 2019 | 377868 | 174109 | 36842 | 19997 | 10594 | 3107 | 2110 | 290 |