| Year | Count |
|---|---|
| 1915 | 10 |
| 1916 | 10 |
| 1921 | 12 |
| 1922 | 10 |
| 1923 | 30 |
| 1926 | 33 |
| 1928 | 15 |
| 1930 | 6 |
| 1935 | 5 |
| 1947 | 5 |
| 1948 | 15 |
| 1953 | 23 |
| 1954 | 14 |
| 1956 | 15 |
| 1958 | 16 |
| 1959 | 10 |
| 1960 | 12 |
| 1961 | 40 |
| 1962 | 14 |
| 1963 | 31 |
| 1964 | 50 |
| 1965 | 34 |
| 1966 | 68 |
| 1967 | 67 |
| 1968 | 109 |
| 1969 | 82 |
| 1970 | 64 |
| 1971 | 44 |
| 1972 | 57 |
| 1973 | 74 |
| 1974 | 78 |
| 1975 | 126 |
| 1976 | 106 |
| 1977 | 86 |
| 1978 | 39 |
| 1979 | 88 |
| 1980 | 40 |
| 1981 | 30 |
| 1982 | 27 |
| 1983 | 25 |
| 1984 | 16 |
| 1985 | 25 |
| 1986 | 10 |
| 1987 | 12 |
| 1988 | 11 |
| 1992 | 19 |
| 1993 | 5 |
| 1994 | 17 |
| 1995 | 5 |
| 1996 | 12 |
| 1997 | 19 |
| 2001 | 10 |
| 2003 | 8 |
| 2005 | 10 |
| 2006 | 6 |
| 2007 | 10 |
| 2009 | 6 |
| 2010 | 5 |
| 2017 | 12 |