| Year | Count |
|---|---|
| 1918 | 5 |
| 1921 | 6 |
| 1922 | 6 |
| 1924 | 12 |
| 1926 | 12 |
| 1927 | 20 |
| 1929 | 18 |
| 1931 | 22 |
| 1937 | 16 |
| 1938 | 12 |
| 1939 | 12 |
| 1940 | 12 |
| 1948 | 5 |
| 1950 | 5 |
| 1953 | 6 |
| 1955 | 9 |
| 1956 | 11 |
| 1957 | 28 |
| 1958 | 20 |
| 1959 | 10 |
| 1960 | 14 |
| 1961 | 5 |
| 1962 | 12 |
| 1963 | 9 |
| 1964 | 9 |
| 1965 | 9 |
| 1967 | 5 |
| 1968 | 5 |
| 1969 | 8 |
| 1971 | 6 |
| 1972 | 15 |
| 1973 | 6 |
| 1978 | 15 |
| 1979 | 20 |
| 1982 | 6 |
| 1984 | 8 |
| 1985 | 6 |
| 1986 | 10 |
| 1989 | 5 |
| 1991 | 5 |
| 1995 | 7 |
| 1996 | 7 |
| 2003 | 6 |
| 2005 | 5 |
| 2007 | 12 |
| 2008 | 20 |
| 2009 | 10 |
| 2010 | 10 |
| 2011 | 17 |
| 2012 | 10 |
| 2013 | 23 |
| 2014 | 56 |
| 2015 | 87 |
| 2016 | 100 |
| 2017 | 140 |
| 2018 | 154 |
| 2019 | 186 |
| 2020 | 209 |
| 2021 | 244 |
| 2022 | 268 |
| 2023 | 302 |
| 2024 | 338 |