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| Year | Number of living female breeding animals | Number of living male breeding animals |
|---|---|---|
| 2001 | 18 | 6 |
| 2002 | 20 | 9 |
| 2003 | 32 | 11 |
| 2005 | 51 | 15 |
| 2006 | 52 | 14 |
| 2007 | 48 | 16 |
| 2008 | 39 | 12 |
| 2009 | 182 | 13 |
| 2010 | 43 | 10 |
| 2011 | 57 | 17 |
| 2012 | 71 | 19 |
| 2013 | 79 | 18 |
| 2014 | 78 | 15 |
| 2015 | 49 | 10 |
| 2016 | 64 | 16 |
| 2017 | 53 | 12 |
| 2018 | 51 | 11 |
| 2019 | 51 | 13 |
| 2020 | 60 | 14 |
| 2021 | 16 | 4 |
| 2022 | 2 | 4 |
| 2023 | 2 | 4 |
| 2024 | 3 | 2 |