| Year | Count |
|---|---|
| 1915 | 5 |
| 1920 | 5 |
| 1920 | 5 |
| 1923 | 5 |
| 1927 | 5 |
| 1931 | 10 |
| 1955 | 14 |
| 1958 | 10 |
| 1960 | 6 |
| 1962 | 16 |
| 1963 | 14 |
| 1965 | 6 |
| 1966 | 16 |
| 1968 | 20 |
| 1969 | 17 |
| 1970 | 16 |
| 1971 | 18 |
| 1972 | 34 |
| 1973 | 11 |
| 1974 | 32 |
| 1976 | 38 |
| 1977 | 45 |
| 1978 | 33 |
| 1979 | 60 |
| 1980 | 24 |
| 1981 | 30 |
| 1982 | 41 |
| 1983 | 48 |
| 1984 | 23 |
| 1985 | 32 |
| 1986 | 18 |
| 1987 | 27 |
| 1988 | 14 |
| 1989 | 29 |
| 1990 | 33 |
| 1991 | 36 |
| 1992 | 56 |
| 1993 | 13 |
| 1994 | 21 |
| 1995 | 18 |
| 1996 | 9 |
| 1997 | 7 |
| 1998 | 11 |
| 1999 | 26 |
| 2000 | 10 |
| 2001 | 20 |
| 2002 | 25 |
| 2003 | 14 |
| 2004 | 10 |
| 2007 | 33 |
| 2008 | 30 |
| 2009 | 19 |
| 2010 | 14 |
| 2014 | 5 |
| 2015 | 10 |
| 2016 | 12 |
| 2019 | 7 |