| Table 2. Estimated stock numbers. | |||||||
| Year\Age | 2 | 3 | 4 | 5 | 6 | 7 | 8+ |
| 2005 | 10788594 | 9606975 | 6872235 | 2943177 | 1074107 | 300139 | 299240 |
| 2006 | 11353084 | 9860032 | 7046207 | 3026750 | 1116825 | 308970 | 306202 |
| 2007 | 12310954 | 10777811 | 7526946 | 3194688 | 1172912 | 332036 | 327093 |
| 2008 | 12079254 | 10734785 | 7542015 | 3172403 | 1160081 | 322868 | 322868 |
| 2009 | 11733986 | 10448824 | 7526946 | 3156581 | 1147390 | 316159 | 316159 |
| 2010 | 12622607 | 10842672 | 7725213 | 3291981 | 1194215 | 330380 | 326766 |
| 2011 | 12584796 | 11387195 | 8064643 | 3440062 | 1266794 | 349759 | 342833 |
| 2012 | 12572218 | 11296460 | 8227560 | 3492052 | 1275693 | 356825 | 353628 |
| 2013 | 12635236 | 11028573 | 7944576 | 3426329 | 1256700 | 342148 | 342148 |
| 2014 | 13978067 | 11851915 | 8268800 | 3506048 | 1278247 | 355756 | 350109 |