| Year | Count |
|---|---|
| 1923 | 10 |
| 1950 | 5 |
| 1952 | 7 |
| 1954 | 6 |
| 1955 | 10 |
| 1956 | 9 |
| 1957 | 16 |
| 1958 | 18 |
| 1959 | 20 |
| 1960 | 12 |
| 1961 | 18 |
| 1962 | 9 |
| 1963 | 6 |
| 1964 | 11 |
| 1965 | 11 |
| 1966 | 10 |
| 1967 | 9 |
| 1968 | 5 |
| 1969 | 9 |
| 1970 | 8 |
| 1972 | 7 |
| 1974 | 8 |
| 1975 | 5 |
| 1976 | 10 |
| 1977 | 12 |
| 1979 | 10 |
| 1983 | 6 |
| 1986 | 6 |
| 1993 | 6 |
| 1994 | 7 |
| 1995 | 6 |
| 1996 | 5 |
| 1997 | 8 |
| 1999 | 6 |
| 2000 | 6 |
| 2001 | 5 |
| 2002 | 7 |
| 2003 | 7 |
| 2005 | 6 |
| 2006 | 9 |
| 2007 | 8 |
| 2010 | 5 |