| Table 3. Estimated stock numbers at age. | |||
| Year Age | 1 | 2 | 3 |
| 1992 | 135526 | 75124 | 7005 |
| 1993 | 133730 | 88099 | 9944 |
| 1994 | 182074 | 86934 | 11318 |
| 1995 | 184862 | 118422 | 11610 |
| 1996 | 156849 | 120238 | 17538 |
| 1997 | 124188 | 102038 | 16684 |
| 1998 | 122121 | 80767 | 10894 |
| 1999 | 107856 | 79444 | 5358 |
| 2000 | 95365 | 70200 | 3915 |
| 2001 | 57646 | 62106 | 3297 |
| 2002 | 38313 | 37549 | 3191 |
| 2003 | 25679 | 24950 | 1921 |
| 2004 | 20983 | 16704 | 1399 |
| 2005 | 19073 | 13639 | 1039 |
| 2006 | 17690 | 12398 | 924 |
| 2007 | 14583 | 11491 | 944 |
| 2008 | 16411 | 9475 | 1044 |
| 2009 | 33173 | 10670 | 1376 |
| 2010 | 47217 | 21584 | 1651 |
| 2011 | 34490 | 30743 | 4035 |
| 2012 | 33705 | 22456 | 6937 |
| 2013 | 35787 | 21956 | 6537 |