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| Year | Number of living female breeding animals | Number of living male breeding animals |
|---|---|---|
| 1997 | 6744 | 822 |
| 1998 | 7324 | 821 |
| 1999 | 6759 | 890 |
| 2001 | 7340 | 733 |
| 2002 | 8845 | 696 |
| 2003 | 8393 | 813 |
| 2004 | 7547 | 640 |
| 2005 | 8690 | 525 |
| 2006 | 7918 | 421 |
| 2007 | 5834 | 385 |
| 2008 | 4481 | 290 |
| 2009 | 5812 | 284 |
| 2010 | 4972 | 261 |
| 2011 | 4983 | 201 |
| 2012 | 4945 | 228 |
| 2013 | 4161 | 183 |
| 2014 | 3835 | 166 |
| 2015 | 4407 | 144 |
| 2016 | 4305 | 165 |
| 2017 | 4775 | 152 |
| 2018 | 4149 | 99 |
| 2019 | 3853 | 117 |
| 2020 | 3763 | 179 |
| 2021 | 3444 | 148 |
| 2022 | 3358 | 120 |
| 2023 | 3835 | 112 |
| 2024 | 3693 | 66 |