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| Year | Number of living female breeding animals | Number of living male breeding animals |
|---|---|---|
| 1997 | 1768 | 77 |
| 1998 | 1503 | 73 |
| 1999 | 1087 | 62 |
| 2000 | 906 | 57 |
| 2001 | 917 | 61 |
| 2002 | 941 | 28 |
| 2003 | 980 | 15 |
| 2004 | 716 | 24 |
| 2005 | 693 | 36 |
| 2006 | 652 | 33 |
| 2007 | 517 | 30 |
| 2008 | 219 | 24 |
| 2009 | 268 | 21 |
| 2010 | 290 | 17 |
| 2011 | 225 | 16 |
| 2012 | 20 | 2 |
| 2013 | 27 | 1 |
| 2014 | 19 | 5 |
| 2015 | 25 | 4 |
| 2016 | 22 | 4 |
| 2017 | 22 | 2 |
| 2018 | 38 | 6 |
| 2019 | 83 | 21 |
| 2020 | 84 | 14 |
| 2021 | 135 | 18 |
| 2022 | 134 | 19 |
| 2023 | 121 | 16 |
| 2024 | 370 | 11 |