| Year | Count |
|---|---|
| 1925 | 10 |
| 1928 | 10 |
| 1934 | 5 |
| 1937 | 5 |
| 1940 | 5 |
| 1945 | 6 |
| 1947 | 11 |
| 1948 | 10 |
| 1950 | 10 |
| 1951 | 8 |
| 1952 | 37 |
| 1953 | 11 |
| 1954 | 15 |
| 1955 | 18 |
| 1956 | 20 |
| 1957 | 18 |
| 1958 | 12 |
| 1959 | 39 |
| 1960 | 27 |
| 1961 | 42 |
| 1962 | 6 |
| 1963 | 13 |
| 1964 | 8 |
| 1965 | 10 |
| 1966 | 9 |
| 1969 | 7 |
| 1971 | 5 |
| 1974 | 5 |
| 1976 | 17 |
| 1980 | 17 |
| 1986 | 10 |
| 1990 | 6 |
| 1993 | 20 |
| 1996 | 21 |
| 1997 | 8 |
| 1999 | 7 |
| 2000 | 5 |
| 2002 | 16 |
| 2003 | 19 |
| 2004 | 14 |
| 2005 | 28 |
| 2006 | 11 |
| 2007 | 11 |
| 2008 | 9 |
| 2010 | 23 |
| 2011 | 33 |
| 2012 | 36 |
| 2013 | 13 |
| 2014 | 27 |
| 2015 | 53 |
| 2016 | 97 |
| 2017 | 58 |
| 2018 | 48 |
| 2019 | 62 |
| 2020 | 75 |
| 2021 | 62 |
| 2022 | 73 |
| 2023 | 55 |
| 2024 | 46 |