| Year | Count |
|---|---|
| 1948 | 10 |
| 1952 | 7 |
| 1954 | 6 |
| 1956 | 22 |
| 1957 | 19 |
| 1958 | 58 |
| 1959 | 8 |
| 1960 | 40 |
| 1961 | 40 |
| 1962 | 58 |
| 1963 | 43 |
| 1964 | 23 |
| 1965 | 32 |
| 1966 | 35 |
| 1967 | 43 |
| 1968 | 53 |
| 1969 | 67 |
| 1970 | 37 |
| 1971 | 67 |
| 1972 | 37 |
| 1973 | 10 |
| 1974 | 14 |
| 1975 | 13 |
| 1976 | 7 |
| 1977 | 19 |
| 1978 | 23 |
| 1980 | 21 |
| 1981 | 11 |
| 1982 | 8 |
| 1983 | 8 |
| 1984 | 26 |
| 1985 | 15 |
| 1987 | 10 |
| 1991 | 10 |
| 1992 | 32 |
| 1993 | 5 |
| 1995 | 5 |
| 1996 | 5 |
| 1997 | 5 |
| 1998 | 21 |
| 1999 | 12 |
| 2000 | 5 |
| 2001 | 5 |
| 2002 | 10 |
| 2003 | 14 |
| 2004 | 52 |
| 2005 | 41 |
| 2006 | 51 |
| 2007 | 34 |
| 2008 | 5 |
| 2013 | 10 |
| 2014 | 10 |