| Year | Count |
|---|---|
| 1954 | 7 |
| 1955 | 5 |
| 1956 | 7 |
| 1957 | 18 |
| 1958 | 18 |
| 1959 | 24 |
| 1960 | 12 |
| 1961 | 22 |
| 1962 | 9 |
| 1963 | 8 |
| 1964 | 11 |
| 1965 | 16 |
| 1966 | 16 |
| 1967 | 9 |
| 1968 | 10 |
| 1969 | 14 |
| 1970 | 13 |
| 1971 | 11 |
| 1972 | 17 |
| 1973 | 9 |
| 1974 | 5 |
| 1975 | 8 |
| 1976 | 27 |
| 1977 | 20 |
| 1979 | 12 |
| 1980 | 5 |
| 1981 | 5 |
| 1982 | 7 |
| 1986 | 6 |
| 1990 | 6 |
| 1992 | 5 |
| 1993 | 7 |
| 1994 | 9 |
| 1998 | 9 |
| 2001 | 10 |
| 2002 | 21 |
| 2003 | 22 |
| 2004 | 41 |
| 2005 | 48 |
| 2006 | 6 |
| 2007 | 27 |
| 2008 | 12 |
| 2009 | 36 |
| 2010 | 14 |
| 2011 | 20 |
| 2012 | 29 |
| 2013 | 10 |
| 2015 | 22 |
| 2016 | 28 |
| 2017 | 52 |
| 2018 | 14 |
| 2019 | 16 |
| 2020 | 8 |
| 2021 | 5 |
| 2022 | 33 |
| 2023 | 16 |
| 2024 | 13 |