| Year | Count |
|---|---|
| 1946 | 5 |
| 1957 | 15 |
| 1958 | 25 |
| 1959 | 29 |
| 1960 | 11 |
| 1961 | 41 |
| 1962 | 44 |
| 1963 | 69 |
| 1964 | 63 |
| 1965 | 66 |
| 1966 | 77 |
| 1967 | 113 |
| 1968 | 109 |
| 1969 | 48 |
| 1970 | 69 |
| 1971 | 73 |
| 1972 | 59 |
| 1973 | 59 |
| 1974 | 95 |
| 1975 | 44 |
| 1976 | 31 |
| 1977 | 27 |
| 1978 | 36 |
| 1979 | 30 |
| 1980 | 39 |
| 1981 | 27 |
| 1982 | 59 |
| 1983 | 15 |
| 1984 | 11 |
| 1985 | 25 |
| 1986 | 19 |
| 1987 | 22 |
| 1988 | 8 |
| 1990 | 15 |
| 1991 | 10 |
| 1992 | 12 |
| 1995 | 20 |
| 1996 | 16 |
| 1997 | 11 |
| 1998 | 23 |
| 1999 | 44 |
| 2000 | 57 |
| 2001 | 110 |
| 2002 | 55 |
| 2003 | 78 |
| 2004 | 127 |
| 2005 | 137 |
| 2006 | 129 |
| 2007 | 84 |
| 2008 | 129 |
| 2009 | 20 |
| 2010 | 21 |
| 2011 | 11 |
| 2024 | 5 |