| Year | Count |
|---|---|
| 1954 | 6 |
| 1956 | 7 |
| 1959 | 16 |
| 1960 | 22 |
| 1961 | 18 |
| 1962 | 7 |
| 1963 | 5 |
| 1964 | 5 |
| 1965 | 9 |
| 1966 | 5 |
| 1967 | 5 |
| 1969 | 6 |
| 1982 | 6 |
| 1985 | 6 |
| 1989 | 5 |
| 1990 | 5 |
| 1991 | 5 |
| 1992 | 6 |
| 1993 | 5 |
| 1994 | 5 |
| 1995 | 5 |
| 1996 | 5 |
| 1997 | 6 |
| 1999 | 7 |
| 2000 | 11 |
| 2001 | 5 |
| 2002 | 9 |
| 2003 | 8 |
| 2004 | 5 |
| 2005 | 6 |
| 2007 | 5 |
| 2010 | 6 |
| 2011 | 5 |
| 2012 | 5 |
| 2013 | 7 |
| 2014 | 10 |
| 2015 | 30 |
| 2016 | 21 |
| 2018 | 14 |
| 2019 | 10 |
| 2020 | 12 |
| 2021 | 12 |
| 2022 | 16 |
| 2023 | 18 |
| 2024 | 14 |