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| Year | Number of living female breeding animals | Number of living male breeding animals |
|---|---|---|
| 1997 | 119 | 25 |
| 1998 | 122 | 22 |
| 1999 | 139 | 27 |
| 2000 | 131 | 28 |
| 2001 | 130 | 28 |
| 2002 | 121 | 27 |
| 2003 | 122 | 27 |
| 2004 | 105 | 28 |
| 2005 | 119 | 33 |
| 2006 | 110 | 34 |
| 2007 | 135 | 36 |
| 2008 | 143 | 31 |
| 2009 | 162 | 33 |
| 2010 | 134 | 29 |
| 2011 | 130 | 32 |
| 2012 | 121 | 34 |
| 2013 | 139 | 30 |
| 2014 | 116 | 27 |
| 2015 | 132 | 26 |
| 2016 | 131 | 20 |
| 2017 | 104 | 21 |
| 2018 | 107 | 20 |
| 2019 | 118 | 25 |
| 2020 | 124 | 30 |
| 2021 | 126 | 34 |
| 2022 | 137 | 31 |
| 2023 | 123 | 28 |
| 2024 | 123 | 31 |