| Table 3. Estimated stock numbers at age. | ||||||
| Year Age | 1 | 2 | 3 | 4 | 5 | 6 | 
| 1997 | 16756 | 6063 | 9085 | 1466 | 328 | 134 | 
| 1998 | 12900 | 11541 | 2731 | 2686 | 376 | 114 | 
| 1999 | 12079 | 8722 | 5693 | 721 | 582 | 107 | 
| 2000 | 6875 | 8055 | 3651 | 1394 | 161 | 148 | 
| 2001 | 6277 | 4291 | 3057 | 832 | 264 | 60 | 
| 2002 | 10873 | 3825 | 1612 | 665 | 136 | 56 | 
| 2003 | 2693 | 6330 | 1304 | 385 | 154 | 42 | 
| 2004 | 14839 | 1612 | 2035 | 314 | 106 | 56 | 
| 2005 | 7029 | 8399 | 477 | 566 | 83 | 44 | 
| 2006 | 6474 | 3782 | 2254 | 126 | 144 | 34 | 
| 2007 | 1738 | 2939 | 800 | 436 | 38 | 55 | 
| 2008 | 1072 | 688 | 458 | 147 | 98 | 22 | 
| 2009 | 3318 | 432 | 115 | 80 | 25 | 18 | 
| 2010 | 2806 | 1424 | 105 | 28 | 13 | 7 | 
| 2011 | 3465 | 1330 | 357 | 31 | 8 | 5 | 
| 2012 | 7606 | 1666 | 329 | 122 | 14 | 6 | 
| 2013 | 9931 | 3653 | 584 | 158 | 52 | 10 | 
| 2014 | 3337 | 5195 | 1158 | 311 | 88 | 34 | 
| 2015 | 2389 | 1533 | 1683 | 632 | 176 | 69 | 
| 2016 | 840 | 1114 | 594 | 697 | 297 | 117 | 
| 2017 | 3333 | 454 | 408 | 211 | 212 | 123 | 
| 2018 | 639 | 1471 | 102 | 147 | 71 | 106 | 
| 2019 | 1045 | 324 | 350 | 36 | 29 | 26 | 
| 2020 | 2765 | 504 | 89 | 117 | 7 | 11 |