| Year | Count |
|---|---|
| 1916 | 6 |
| 1917 | 7 |
| 1918 | 6 |
| 1919 | 9 |
| 1923 | 16 |
| 1956 | 5 |
| 1961 | 6 |
| 1962 | 9 |
| 1963 | 8 |
| 1965 | 7 |
| 1967 | 7 |
| 1968 | 9 |
| 1969 | 13 |
| 1970 | 21 |
| 1971 | 27 |
| 1972 | 14 |
| 1973 | 18 |
| 1974 | 12 |
| 1975 | 5 |
| 1976 | 11 |
| 1977 | 34 |
| 1978 | 18 |
| 1979 | 12 |
| 1981 | 9 |
| 1983 | 9 |
| 1984 | 9 |
| 1986 | 9 |
| 1987 | 6 |
| 1988 | 12 |
| 1990 | 5 |
| 1991 | 9 |
| 1992 | 6 |
| 1993 | 5 |
| 1994 | 5 |
| 1995 | 5 |
| 1998 | 6 |