| Year | Count |
|---|---|
| 1917 | 5 |
| 1929 | 5 |
| 1931 | 5 |
| 1943 | 7 |
| 1956 | 5 |
| 1958 | 7 |
| 1960 | 8 |
| 1961 | 10 |
| 1962 | 7 |
| 1963 | 9 |
| 1964 | 15 |
| 1965 | 6 |
| 1967 | 7 |
| 1968 | 6 |
| 1969 | 9 |
| 1970 | 10 |
| 1971 | 5 |
| 1972 | 6 |
| 1973 | 5 |
| 1974 | 6 |
| 1975 | 9 |
| 1976 | 6 |
| 1977 | 7 |
| 1978 | 10 |
| 1979 | 7 |
| 1980 | 6 |
| 1981 | 5 |
| 1982 | 7 |
| 1987 | 5 |
| 1988 | 5 |
| 1997 | 6 |
| 1998 | 5 |
| 2000 | 6 |
| 2002 | 9 |
| 2004 | 7 |
| 2005 | 5 |
| 2007 | 10 |
| 2008 | 8 |
| 2009 | 10 |
| 2010 | 6 |
| 2011 | 9 |
| 2012 | 10 |
| 2013 | 7 |
| 2015 | 8 |
| 2016 | 22 |
| 2017 | 20 |
| 2018 | 18 |
| 2019 | 30 |
| 2020 | 12 |
| 2021 | 7 |
| 2022 | 9 |
| 2023 | 13 |
| 2024 | 10 |