| Year | Count |
|---|---|
| 1955 | 7 |
| 1958 | 5 |
| 1963 | 5 |
| 1967 | 15 |
| 1982 | 11 |
| 1985 | 6 |
| 1986 | 12 |
| 1987 | 10 |
| 1988 | 24 |
| 1989 | 25 |
| 1990 | 18 |
| 1991 | 24 |
| 1992 | 50 |
| 1993 | 11 |
| 1994 | 22 |
| 1995 | 24 |
| 1996 | 26 |
| 1997 | 21 |
| 1998 | 26 |
| 1999 | 43 |
| 2000 | 54 |
| 2001 | 62 |
| 2002 | 51 |
| 2003 | 61 |
| 2004 | 50 |
| 2005 | 50 |
| 2006 | 59 |
| 2007 | 54 |
| 2008 | 50 |
| 2009 | 38 |
| 2010 | 50 |
| 2011 | 39 |
| 2012 | 31 |
| 2013 | 25 |
| 2014 | 45 |
| 2015 | 45 |
| 2016 | 29 |
| 2017 | 32 |
| 2018 | 34 |
| 2019 | 12 |
| 2020 | 27 |
| 2021 | 22 |
| 2022 | 25 |
| 2023 | 17 |
| 2024 | 17 |