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| Year | Number of living female breeding animals | Number of living male breeding animals |
|---|---|---|
| 2002 | 9 | 1 |
| 2003 | 12 | 1 |
| 2005 | 5 | - |
| 2006 | 5 | - |
| 2007 | 5 | - |
| 2008 | 5 | - |
| 2009 | 5 | - |
| 2010 | 5 | - |
| 2011 | 5 | - |
| 2012 | 7 | 1 |
| 2013 | 9 | 1 |
| 2014 | 11 | 2 |
| 2015 | 12 | 5 |
| 2016 | 12 | 5 |
| 2017 | 21 | 7 |
| 2018 | 17 | 8 |
| 2019 | 20 | 9 |
| 2020 | 15 | 6 |
| 2021 | 18 | 4 |
| 2022 | 22 | 1 |
| 2023 | 22 | 1 |
| 2024 | 24 | 5 |