| Year | Count |
|---|---|
| 1950 | 6 |
| 1962 | 5 |
| 1970 | 18 |
| 1972 | 5 |
| 1973 | 5 |
| 1974 | 47 |
| 1975 | 17 |
| 1976 | 18 |
| 1978 | 21 |
| 1980 | 16 |
| 1981 | 11 |
| 1982 | 24 |
| 1983 | 22 |
| 1984 | 28 |
| 1985 | 36 |
| 1986 | 31 |
| 1987 | 24 |
| 1988 | 5 |
| 1990 | 12 |
| 1991 | 11 |
| 1996 | 5 |
| 1997 | 22 |
| 1998 | 5 |
| 2000 | 5 |
| 2001 | 6 |
| 2003 | 27 |
| 2004 | 20 |
| 2005 | 49 |
| 2006 | 20 |
| 2007 | 7 |
| 2008 | 39 |
| 2009 | 36 |
| 2010 | 54 |
| 2011 | 48 |
| 2012 | 115 |
| 2013 | 142 |
| 2014 | 126 |
| 2015 | 108 |
| 2016 | 122 |
| 2017 | 60 |
| 2018 | 54 |
| 2019 | 95 |
| 2020 | 37 |
| 2021 | 42 |
| 2022 | 38 |
| 2023 | 109 |
| 2024 | 90 |