| Year | Count |
|---|---|
| 1929 | 10 |
| 1944 | 5 |
| 1946 | 5 |
| 1947 | 6 |
| 1949 | 5 |
| 1950 | 8 |
| 1951 | 7 |
| 1952 | 10 |
| 1953 | 5 |
| 1954 | 7 |
| 1957 | 20 |
| 1958 | 12 |
| 1959 | 22 |
| 1960 | 18 |
| 1961 | 28 |
| 1962 | 5 |
| 1963 | 5 |
| 1965 | 9 |
| 1966 | 7 |
| 1967 | 7 |
| 1968 | 7 |
| 1969 | 8 |
| 1970 | 12 |
| 1971 | 12 |
| 1973 | 8 |
| 1975 | 6 |
| 1977 | 18 |
| 1978 | 16 |
| 1982 | 7 |
| 1983 | 6 |
| 1985 | 6 |
| 1986 | 7 |
| 1987 | 7 |
| 1988 | 8 |
| 1989 | 9 |
| 1990 | 8 |
| 1991 | 6 |
| 1992 | 9 |
| 1993 | 7 |
| 1994 | 15 |
| 1995 | 8 |
| 1997 | 7 |
| 1999 | 6 |
| 2001 | 8 |
| 2002 | 6 |
| 2007 | 6 |
| 2008 | 5 |
| 2011 | 5 |