| Year | Count |
|---|---|
| 1961 | 5 |
| 1964 | 7 |
| 1969 | 5 |
| 1971 | 10 |
| 1972 | 10 |
| 1979 | 12 |
| 1989 | 15 |
| 1990 | 7 |
| 1991 | 10 |
| 1995 | 17 |
| 1996 | 40 |
| 1998 | 10 |
| 1999 | 8 |
| 2001 | 23 |
| 2002 | 18 |
| 2003 | 52 |
| 2004 | 27 |
| 2005 | 60 |
| 2006 | 16 |
| 2007 | 33 |
| 2008 | 28 |
| 2009 | 30 |
| 2010 | 42 |
| 2011 | 47 |
| 2012 | 16 |
| 2013 | 52 |
| 2014 | 26 |
| 2015 | 97 |
| 2016 | 85 |
| 2017 | 98 |
| 2018 | 52 |
| 2019 | 66 |
| 2020 | 36 |
| 2021 | 56 |
| 2022 | 30 |
| 2023 | 29 |
| 2024 | 57 |