| Year | Count |
|---|---|
| 1913 | 5 |
| 1958 | 10 |
| 1962 | 5 |
| 1964 | 10 |
| 1967 | 6 |
| 1968 | 6 |
| 1969 | 5 |
| 1970 | 7 |
| 1971 | 45 |
| 1972 | 47 |
| 1973 | 49 |
| 1974 | 51 |
| 1975 | 28 |
| 1976 | 114 |
| 1977 | 346 |
| 1978 | 142 |
| 1979 | 87 |
| 1980 | 73 |
| 1981 | 68 |
| 1982 | 67 |
| 1983 | 73 |
| 1984 | 88 |
| 1985 | 98 |
| 1986 | 92 |
| 1987 | 77 |
| 1988 | 75 |
| 1989 | 95 |
| 1990 | 56 |
| 1991 | 51 |
| 1992 | 103 |
| 1993 | 129 |
| 1994 | 129 |
| 1995 | 111 |
| 1996 | 80 |
| 1997 | 73 |
| 1998 | 46 |
| 1999 | 52 |
| 2000 | 55 |
| 2001 | 42 |
| 2002 | 35 |
| 2003 | 26 |
| 2004 | 15 |
| 2005 | 25 |
| 2006 | 34 |
| 2008 | 5 |
| 2009 | 17 |
| 2011 | 29 |
| 2012 | 10 |
| 2013 | 17 |
| 2014 | 19 |
| 2018 | 7 |
| 2021 | 5 |
| 2023 | 12 |