| Year | Count |
|---|---|
| 1938 | 14 |
| 1939 | 9 |
| 1940 | 14 |
| 1942 | 11 |
| 1943 | 5 |
| 1944 | 8 |
| 1945 | 5 |
| 1946 | 11 |
| 1948 | 7 |
| 1949 | 10 |
| 1953 | 5 |
| 1954 | 6 |
| 1961 | 5 |
| 1966 | 7 |
| 1981 | 5 |
| 1986 | 12 |
| 1993 | 5 |
| 1994 | 6 |
| 1996 | 6 |
| 1997 | 5 |
| 2000 | 14 |
| 2003 | 17 |
| 2004 | 14 |
| 2005 | 35 |
| 2006 | 16 |
| 2007 | 21 |
| 2010 | 7 |
| 2011 | 11 |
| 2012 | 5 |
| 2013 | 10 |
| 2014 | 12 |
| 2016 | 17 |
| 2017 | 11 |
| 2019 | 17 |
| 2022 | 15 |
| 2024 | 10 |