| Table 2. Estimated stock numbers. | |||||||
| Year\Age | 1 | 2 | 3 | 4 | 5 | 6 | 7+ |
| 1999 | 49 | 25 | 11 | 8 | 3 | 1 | 1 |
| 2000 | 46 | 39 | 17 | 5 | 2 | 1 | 0 |
| 2001 | 33 | 36 | 26 | 8 | 1 | 1 | 1 |
| 2002 | 34 | 25 | 23 | 13 | 2 | 0 | 0 |
| 2003 | 26 | 27 | 15 | 10 | 4 | 1 | 0 |
| 2004 | 30 | 20 | 16 | 7 | 4 | 2 | 0 |
| 2005 | 29 | 24 | 13 | 8 | 3 | 2 | 1 |
| 2006 | 24 | 23 | 16 | 7 | 3 | 1 | 1 |
| 2007 | 23 | 19 | 15 | 8 | 3 | 1 | 1 |
| 2008 | 30 | 18 | 13 | 7 | 3 | 1 | 1 |
| 2009 | 38 | 24 | 11 | 6 | 3 | 1 | 1 |
| 2010 | 49 | 31 | 15 | 6 | 3 | 1 | 1 |
| 2011 | 57 | 39 | 22 | 9 | 3 | 2 | 1 |
| 2012 | 58 | 46 | 30 | 15 | 6 | 2 | 2 |
| 2013 | 59 | 47 | 37 | 22 | 11 | 4 | 3 |
| 2014 | 50 | 48 | 38 | 29 | 17 | 9 | 6 |