| Year | Count |
|---|---|
| 1920 | 6 |
| 1921 | 21 |
| 1923 | 25 |
| 1924 | 23 |
| 1925 | 5 |
| 1927 | 12 |
| 1958 | 12 |
| 1959 | 10 |
| 1960 | 14 |
| 1962 | 16 |
| 1963 | 12 |
| 1964 | 47 |
| 1965 | 12 |
| 1966 | 10 |
| 1968 | 20 |
| 1969 | 7 |
| 1970 | 10 |
| 1970 | 22 |
| 1971 | 21 |
| 1972 | 26 |
| 1973 | 42 |
| 1974 | 56 |
| 1975 | 71 |
| 1976 | 66 |
| 1977 | 68 |
| 1978 | 98 |
| 1979 | 64 |
| 1980 | 98 |
| 1981 | 61 |
| 1982 | 5 |
| 1982 | 49 |
| 1983 | 41 |
| 1984 | 40 |
| 1985 | 49 |
| 1986 | 48 |
| 1987 | 33 |
| 1988 | 34 |
| 1989 | 44 |
| 1990 | 47 |
| 1991 | 14 |
| 1992 | 10 |
| 1993 | 8 |
| 1994 | 19 |
| 1995 | 27 |
| 1996 | 18 |
| 1997 | 10 |
| 1998 | 9 |
| 1999 | 5 |
| 2000 | 17 |
| 2001 | 14 |
| 2004 | 10 |
| 2005 | 12 |
| 2006 | 8 |
| 2007 | 7 |
| 2008 | 6 |
| 2017 | 10 |
| 2018 | 5 |