| Year | Count |
|---|---|
| 1926 | 5 |
| 1938 | 8 |
| 1940 | 5 |
| 1946 | 5 |
| 1947 | 10 |
| 1950 | 10 |
| 1951 | 16 |
| 1952 | 6 |
| 1953 | 5 |
| 1954 | 27 |
| 1955 | 34 |
| 1956 | 18 |
| 1957 | 26 |
| 1958 | 111 |
| 1959 | 47 |
| 1960 | 52 |
| 1961 | 32 |
| 1962 | 70 |
| 1963 | 59 |
| 1964 | 39 |
| 1965 | 36 |
| 1966 | 26 |
| 1967 | 16 |
| 1968 | 15 |
| 1969 | 26 |
| 1970 | 21 |
| 1971 | 5 |
| 1972 | 31 |
| 1973 | 12 |
| 1974 | 28 |
| 1975 | 25 |
| 1976 | 24 |
| 1977 | 54 |
| 1978 | 39 |
| 1979 | 33 |
| 1980 | 18 |
| 1981 | 6 |
| 1982 | 24 |
| 1983 | 24 |
| 1984 | 16 |
| 1986 | 17 |
| 1987 | 10 |
| 1989 | 5 |
| 1990 | 14 |
| 1991 | 26 |
| 2006 | 10 |
| 2007 | 10 |
| 2009 | 12 |