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| Year | Number of living female breeding animals | Number of living male breeding animals |
|---|---|---|
| 2001 | 25 | 3 |
| 2002 | 32 | 5 |
| 2003 | 40 | 10 |
| 2005 | 27 | 7 |
| 2006 | 28 | 8 |
| 2007 | 36 | 10 |
| 2008 | 40 | 9 |
| 2009 | 44 | 8 |
| 2010 | 39 | 8 |
| 2011 | 37 | 7 |
| 2012 | 40 | 10 |
| 2013 | 40 | 9 |
| 2014 | 44 | 10 |
| 2015 | 43 | 10 |
| 2016 | 42 | 10 |
| 2017 | 46 | 11 |
| 2018 | 43 | 10 |
| 2019 | 43 | 10 |
| 2020 | 44 | 11 |
| 2021 | 42 | 12 |
| 2022 | 41 | 11 |
| 2023 | 36 | 11 |
| 2024 | 43 | 10 |