| Year | Count |
|---|---|
| 1925 | 5 |
| 1931 | 6 |
| 1936 | 5 |
| 1953 | 7 |
| 1954 | 22 |
| 1955 | 103 |
| 1956 | 130 |
| 1957 | 183 |
| 1958 | 161 |
| 1959 | 83 |
| 1960 | 55 |
| 1961 | 28 |
| 1962 | 38 |
| 1963 | 39 |
| 1964 | 12 |
| 1965 | 18 |
| 1966 | 21 |
| 1967 | 9 |
| 1968 | 6 |
| 1969 | 11 |
| 1972 | 5 |
| 1973 | 7 |
| 1974 | 5 |
| 1977 | 10 |
| 1982 | 5 |
| 1983 | 5 |
| 1986 | 6 |
| 1988 | 5 |
| 1990 | 5 |
| 1994 | 5 |
| 2000 | 10 |
| 2001 | 18 |
| 2002 | 20 |
| 2003 | 29 |
| 2004 | 64 |
| 2005 | 87 |
| 2006 | 123 |
| 2007 | 142 |
| 2008 | 202 |
| 2009 | 110 |
| 2010 | 103 |
| 2011 | 103 |
| 2012 | 33 |
| 2013 | 50 |
| 2014 | 66 |
| 2015 | 113 |
| 2016 | 114 |
| 2017 | 69 |
| 2018 | 32 |
| 2019 | 36 |
| 2020 | 41 |
| 2021 | 34 |
| 2022 | 31 |
| 2023 | 5 |
| 2024 | 19 |