| Year | Count |
|---|---|
| 1919 | 10 |
| 1920 | 5 |
| 1922 | 5 |
| 1923 | 6 |
| 1942 | 12 |
| 1946 | 5 |
| 1952 | 7 |
| 1953 | 18 |
| 1954 | 5 |
| 1955 | 6 |
| 1956 | 18 |
| 1959 | 17 |
| 1960 | 31 |
| 1961 | 23 |
| 1962 | 15 |
| 1965 | 38 |
| 1966 | 10 |
| 1967 | 19 |
| 1968 | 45 |
| 1969 | 28 |
| 1970 | 26 |
| 1971 | 60 |
| 1972 | 21 |
| 1973 | 80 |
| 1974 | 43 |
| 1975 | 70 |
| 1976 | 95 |
| 1977 | 53 |
| 1978 | 42 |
| 1979 | 50 |
| 1980 | 58 |
| 1981 | 40 |
| 1982 | 27 |
| 1983 | 13 |
| 1984 | 19 |
| 1985 | 47 |
| 1986 | 16 |
| 1989 | 5 |
| 1990 | 10 |
| 1991 | 11 |
| 1992 | 20 |
| 1993 | 16 |
| 1995 | 16 |
| 1996 | 12 |
| 1997 | 6 |
| 1999 | 8 |
| 2000 | 16 |
| 2001 | 10 |
| 2002 | 10 |