| Year | Count |
|---|---|
| 1915 | 5 |
| 1916 | 6 |
| 1919 | 5 |
| 1921 | 10 |
| 1924 | 6 |
| 1941 | 5 |
| 1943 | 5 |
| 1947 | 12 |
| 1953 | 5 |
| 1955 | 10 |
| 1956 | 16 |
| 1957 | 10 |
| 1958 | 15 |
| 1959 | 35 |
| 1960 | 22 |
| 1961 | 12 |
| 1962 | 21 |
| 1963 | 18 |
| 1964 | 24 |
| 1965 | 22 |
| 1966 | 5 |
| 1967 | 6 |
| 1968 | 5 |
| 1970 | 25 |
| 1971 | 36 |
| 1972 | 6 |
| 1973 | 10 |
| 1974 | 22 |
| 1975 | 27 |
| 1976 | 10 |
| 1977 | 11 |
| 1978 | 6 |
| 1980 | 16 |
| 1981 | 6 |
| 1982 | 15 |
| 1983 | 7 |
| 1984 | 29 |
| 1985 | 20 |
| 1986 | 28 |
| 1987 | 38 |
| 1989 | 21 |
| 1990 | 5 |
| 1991 | 21 |
| 1992 | 13 |
| 1994 | 6 |
| 1995 | 10 |
| 1999 | 11 |
| 2001 | 37 |
| 2005 | 11 |
| 2008 | 10 |
| 2009 | 5 |