| Year | Count |
|---|---|
| 1952 | 5 |
| 1953 | 10 |
| 1954 | 5 |
| 1956 | 23 |
| 1957 | 61 |
| 1958 | 61 |
| 1959 | 32 |
| 1960 | 17 |
| 1961 | 40 |
| 1962 | 25 |
| 1964 | 17 |
| 1965 | 6 |
| 1966 | 11 |
| 1968 | 22 |
| 1970 | 12 |
| 1971 | 9 |
| 1972 | 15 |
| 1973 | 8 |
| 1974 | 15 |
| 1975 | 7 |
| 1976 | 11 |
| 1977 | 25 |
| 1978 | 15 |
| 1979 | 21 |
| 1980 | 11 |
| 1981 | 38 |
| 1982 | 28 |
| 1983 | 24 |
| 1984 | 27 |
| 1985 | 55 |
| 1986 | 33 |
| 1987 | 44 |
| 1988 | 57 |
| 1989 | 8 |
| 1990 | 45 |
| 1991 | 38 |
| 1992 | 56 |
| 1993 | 21 |
| 1994 | 66 |
| 1995 | 44 |
| 1996 | 107 |
| 1997 | 94 |
| 1998 | 83 |
| 1999 | 69 |
| 2000 | 49 |
| 2001 | 52 |
| 2002 | 57 |
| 2003 | 37 |
| 2004 | 86 |
| 2005 | 136 |
| 2006 | 61 |
| 2007 | 42 |
| 2008 | 75 |
| 2009 | 22 |
| 2010 | 17 |
| 2011 | 21 |
| 2016 | 6 |
| 2018 | 6 |
| 2019 | 5 |
| 2020 | 6 |
| 2021 | 5 |
| 2023 | 6 |