| Year | Count |
|---|---|
| 1942 | 5 |
| 1945 | 13 |
| 1946 | 7 |
| 1947 | 7 |
| 1948 | 5 |
| 1950 | 8 |
| 1951 | 7 |
| 1952 | 7 |
| 1954 | 8 |
| 1955 | 6 |
| 1957 | 14 |
| 1959 | 12 |
| 1960 | 12 |
| 1962 | 6 |
| 1963 | 7 |
| 1965 | 9 |
| 1971 | 10 |
| 1983 | 6 |
| 1985 | 5 |
| 1987 | 5 |
| 1988 | 7 |
| 1990 | 13 |
| 1991 | 6 |
| 1993 | 5 |
| 1995 | 10 |
| 1997 | 6 |
| 1998 | 7 |
| 1999 | 5 |
| 2003 | 6 |
| 2006 | 6 |
| 2007 | 5 |
| 2008 | 7 |
| 2009 | 5 |
| 2010 | 13 |
| 2011 | 6 |
| 2012 | 5 |
| 2013 | 8 |
| 2015 | 21 |
| 2016 | 15 |
| 2018 | 20 |
| 2022 | 16 |
| 2023 | 18 |
| 2024 | 10 |