| Year | Count |
|---|---|
| 1948 | 6 |
| 1964 | 8 |
| 1973 | 13 |
| 1974 | 5 |
| 1975 | 5 |
| 1978 | 5 |
| 1979 | 13 |
| 1980 | 11 |
| 1981 | 16 |
| 1982 | 16 |
| 1983 | 8 |
| 1984 | 8 |
| 1987 | 14 |
| 1988 | 11 |
| 1989 | 11 |
| 1990 | 20 |
| 1991 | 23 |
| 1992 | 20 |
| 1993 | 25 |
| 1994 | 20 |
| 1995 | 17 |
| 1996 | 41 |
| 1997 | 24 |
| 1998 | 27 |
| 1999 | 30 |
| 2000 | 66 |
| 2001 | 27 |
| 2002 | 21 |
| 2003 | 28 |
| 2004 | 30 |
| 2005 | 91 |
| 2006 | 50 |
| 2007 | 64 |
| 2008 | 83 |
| 2009 | 68 |
| 2010 | 58 |
| 2011 | 76 |
| 2012 | 44 |
| 2013 | 85 |
| 2014 | 43 |
| 2015 | 59 |
| 2016 | 91 |
| 2017 | 42 |
| 2018 | 22 |
| 2019 | 18 |
| 2020 | 16 |
| 2021 | 41 |
| 2022 | 52 |
| 2023 | 37 |
| 2024 | 23 |