| Year | Count |
|---|---|
| 1913 | 15 |
| 1915 | 18 |
| 1916 | 15 |
| 1917 | 21 |
| 1918 | 18 |
| 1922 | 16 |
| 1923 | 8 |
| 1926 | 8 |
| 1930 | 6 |
| 1934 | 6 |
| 1941 | 5 |
| 1950 | 6 |
| 1952 | 5 |
| 1953 | 6 |
| 1955 | 5 |
| 1956 | 14 |
| 1957 | 16 |
| 1958 | 29 |
| 1959 | 14 |
| 1960 | 18 |
| 1961 | 5 |
| 1963 | 10 |
| 1964 | 24 |
| 1965 | 21 |
| 1966 | 6 |
| 1967 | 11 |
| 1968 | 8 |
| 1969 | 15 |
| 1970 | 20 |
| 1971 | 23 |
| 1972 | 16 |
| 1973 | 32 |
| 1974 | 16 |
| 1975 | 12 |
| 1976 | 16 |
| 1977 | 39 |
| 1978 | 24 |
| 1979 | 24 |
| 1980 | 5 |
| 1981 | 202 |
| 1982 | 55 |
| 1983 | 36 |
| 1984 | 31 |
| 1985 | 22 |
| 1986 | 33 |
| 1987 | 24 |
| 1988 | 25 |
| 1989 | 26 |
| 1990 | 14 |
| 1991 | 49 |
| 1992 | 7 |
| 1993 | 10 |
| 1994 | 9 |
| 1995 | 12 |
| 1996 | 7 |
| 1997 | 8 |
| 2001 | 5 |