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| Year | Number of living female breeding animals | Number of living male breeding animals |
|---|---|---|
| 1998 | 4 | 3 |
| 1999 | 4 | 1 |
| 2000 | 3 | 2 |
| 2001 | 2 | 1 |
| 2002 | 3 | 2 |
| 2003 | 3 | 2 |
| 2005 | 33 | 9 |
| 2006 | 17 | 7 |
| 2007 | 2 | 1 |
| 2010 | 8 | 1 |
| 2011 | 11 | 2 |
| 2012 | 11 | 2 |
| 2013 | 11 | 1 |
| 2014 | 8 | 1 |
| 2015 | 8 | 1 |
| 2016 | 8 | 1 |
| 2017 | 8 | 1 |
| 2018 | 8 | 1 |
| 2019 | 8 | 1 |
| 2023 | 4 | - |
| 2024 | 1 | - |