| Year | Count |
|---|---|
| 1913 | 7 |
| 1914 | 7 |
| 1915 | 23 |
| 1916 | 21 |
| 1917 | 22 |
| 1918 | 9 |
| 1919 | 5 |
| 1920 | 5 |
| 1921 | 12 |
| 1923 | 16 |
| 1924 | 12 |
| 1925 | 10 |
| 1927 | 6 |
| 1952 | 15 |
| 1953 | 10 |
| 1961 | 20 |
| 1968 | 17 |
| 1969 | 26 |
| 1970 | 5 |
| 1973 | 6 |
| 1974 | 10 |
| 1975 | 7 |
| 1976 | 23 |
| 1977 | 10 |
| 1979 | 30 |
| 1980 | 17 |
| 1981 | 13 |
| 1982 | 28 |
| 1983 | 16 |
| 1984 | 8 |
| 1985 | 12 |
| 1986 | 18 |
| 1987 | 31 |
| 1988 | 33 |
| 1989 | 41 |
| 1990 | 19 |
| 1991 | 20 |
| 1992 | 14 |
| 1993 | 15 |
| 1995 | 32 |
| 1999 | 10 |
| 2003 | 5 |
| 2006 | 12 |
| 2008 | 10 |