| Year | Count |
|---|---|
| 1913 | 15 |
| 1914 | 6 |
| 1915 | 17 |
| 1917 | 6 |
| 1921 | 7 |
| 1922 | 9 |
| 1924 | 21 |
| 1926 | 6 |
| 1932 | 6 |
| 1961 | 5 |
| 1965 | 10 |
| 1966 | 8 |
| 1969 | 28 |
| 1970 | 17 |
| 1971 | 32 |
| 1972 | 13 |
| 1975 | 6 |
| 1977 | 12 |
| 1978 | 7 |
| 1981 | 7 |
| 1982 | 32 |
| 1985 | 6 |
| 1986 | 5 |
| 1987 | 24 |
| 1988 | 21 |
| 1989 | 18 |
| 1990 | 16 |
| 1991 | 35 |
| 1992 | 40 |
| 1993 | 24 |
| 1994 | 5 |
| 1995 | 6 |
| 1996 | 5 |
| 1999 | 8 |
| 2005 | 10 |
| 2007 | 6 |
| 2008 | 17 |
| 2009 | 11 |
| 2010 | 14 |
| 2012 | 15 |
| 2013 | 5 |
| 2014 | 6 |
| 2015 | 6 |