| Year | Count |
|---|---|
| 1915 | 14 |
| 1918 | 6 |
| 1922 | 16 |
| 1929 | 10 |
| 1932 | 10 |
| 1933 | 7 |
| 1934 | 8 |
| 1935 | 5 |
| 1937 | 5 |
| 1939 | 6 |
| 1940 | 5 |
| 1944 | 5 |
| 1946 | 5 |
| 1950 | 5 |
| 1951 | 5 |
| 1956 | 5 |
| 1957 | 8 |
| 1959 | 5 |
| 1960 | 15 |
| 1962 | 20 |
| 1966 | 67 |
| 1967 | 26 |
| 1968 | 36 |
| 1970 | 11 |
| 1971 | 5 |
| 1972 | 5 |
| 1974 | 11 |
| 1981 | 5 |
| 1997 | 5 |
| 1999 | 5 |
| 2000 | 11 |
| 2001 | 7 |
| 2003 | 5 |
| 2004 | 21 |
| 2005 | 30 |
| 2006 | 15 |
| 2007 | 20 |
| 2008 | 8 |
| 2009 | 9 |
| 2010 | 29 |
| 2012 | 18 |
| 2013 | 5 |
| 2014 | 5 |
| 2015 | 21 |
| 2016 | 6 |
| 2017 | 16 |
| 2018 | 10 |
| 2019 | 12 |
| 2020 | 6 |
| 2021 | 9 |
| 2022 | 6 |
| 2023 | 5 |
| 2024 | 5 |