| Year | Count |
|---|---|
| 1915 | 5 |
| 1920 | 7 |
| 1924 | 7 |
| 1925 | 7 |
| 1927 | 5 |
| 1930 | 5 |
| 1942 | 6 |
| 1943 | 5 |
| 1944 | 5 |
| 1945 | 5 |
| 1946 | 10 |
| 1947 | 13 |
| 1949 | 10 |
| 1953 | 6 |
| 1955 | 6 |
| 1956 | 6 |
| 1957 | 10 |
| 1958 | 18 |
| 1959 | 7 |
| 1960 | 11 |
| 1962 | 7 |
| 1963 | 6 |
| 1964 | 26 |
| 1965 | 19 |
| 1966 | 7 |
| 1968 | 11 |
| 1969 | 10 |
| 1970 | 13 |
| 1973 | 7 |
| 1974 | 5 |
| 1976 | 7 |
| 1981 | 5 |
| 1983 | 9 |
| 1987 | 6 |
| 1988 | 5 |
| 1989 | 11 |
| 1990 | 8 |
| 1992 | 11 |
| 1993 | 6 |
| 1994 | 5 |
| 1995 | 6 |
| 1999 | 7 |
| 2002 | 5 |
| 2005 | 6 |
| 2008 | 5 |
| 2010 | 8 |
| 2011 | 8 |
| 2013 | 8 |
| 2014 | 5 |
| 2015 | 12 |
| 2016 | 12 |
| 2017 | 16 |
| 2018 | 14 |
| 2019 | 9 |
| 2021 | 5 |