| Year | Count |
|---|---|
| 1930 | 14 |
| 1931 | 6 |
| 1938 | 12 |
| 1939 | 5 |
| 1940 | 11 |
| 1942 | 9 |
| 1943 | 11 |
| 1945 | 10 |
| 1946 | 7 |
| 1947 | 5 |
| 1948 | 7 |
| 1949 | 9 |
| 1950 | 8 |
| 1951 | 6 |
| 1952 | 7 |
| 1953 | 8 |
| 1955 | 5 |
| 1958 | 12 |
| 1959 | 32 |
| 1960 | 12 |
| 1962 | 7 |
| 1963 | 6 |
| 1964 | 6 |
| 1969 | 5 |
| 1978 | 12 |
| 1982 | 5 |
| 1983 | 7 |
| 1987 | 6 |
| 2002 | 6 |
| 2005 | 14 |
| 2006 | 11 |
| 2007 | 11 |
| 2008 | 21 |
| 2009 | 12 |
| 2010 | 22 |
| 2011 | 17 |
| 2012 | 20 |
| 2013 | 26 |
| 2014 | 20 |
| 2015 | 57 |
| 2016 | 54 |
| 2017 | 66 |
| 2018 | 24 |
| 2019 | 50 |
| 2020 | 42 |
| 2021 | 44 |
| 2022 | 44 |
| 2023 | 28 |
| 2024 | 38 |