| Year | Count |
|---|---|
| 1971 | 31 |
| 1972 | 20 |
| 1973 | 22 |
| 1974 | 14 |
| 1990 | 7 |
| 1994 | 7 |
| 1996 | 6 |
| 1999 | 10 |
| 2000 | 12 |
| 2001 | 9 |
| 2002 | 12 |
| 2003 | 29 |
| 2004 | 25 |
| 2005 | 35 |
| 2006 | 25 |
| 2007 | 27 |
| 2008 | 6 |
| 2009 | 16 |
| 2010 | 23 |
| 2011 | 26 |
| 2014 | 15 |
| 2015 | 36 |
| 2016 | 26 |
| 2017 | 49 |
| 2018 | 41 |
| 2019 | 12 |
| 2020 | 55 |
| 2021 | 40 |
| 2022 | 36 |
| 2023 | 31 |
| 2024 | 74 |