| Year | Count |
|---|---|
| 1916 | 8 |
| 1918 | 5 |
| 1923 | 6 |
| 1924 | 7 |
| 1930 | 7 |
| 1931 | 5 |
| 1932 | 6 |
| 1936 | 8 |
| 1937 | 6 |
| 1959 | 5 |
| 1960 | 5 |
| 1962 | 5 |
| 1964 | 6 |
| 1965 | 6 |
| 1966 | 6 |
| 1972 | 7 |
| 1973 | 5 |
| 1975 | 6 |
| 1978 | 6 |
| 1979 | 7 |
| 1980 | 10 |
| 1981 | 5 |
| 1982 | 6 |
| 1983 | 7 |
| 1986 | 5 |
| 1987 | 10 |
| 1988 | 9 |
| 1989 | 6 |
| 1990 | 6 |
| 1991 | 8 |
| 1992 | 14 |
| 1993 | 6 |
| 1994 | 8 |
| 1997 | 6 |
| 1999 | 7 |