| Year | Count |
|---|---|
| 1954 | 5 |
| 1963 | 7 |
| 1964 | 6 |
| 1966 | 6 |
| 1968 | 6 |
| 1970 | 5 |
| 1971 | 14 |
| 1973 | 7 |
| 1975 | 16 |
| 1976 | 13 |
| 1977 | 19 |
| 1978 | 13 |
| 1979 | 17 |
| 1980 | 12 |
| 1981 | 23 |
| 1982 | 23 |
| 1983 | 15 |
| 1984 | 24 |
| 1985 | 31 |
| 1986 | 33 |
| 1987 | 29 |
| 1988 | 25 |
| 1989 | 34 |
| 1990 | 34 |
| 1991 | 45 |
| 1992 | 55 |
| 1993 | 43 |
| 1994 | 38 |
| 1995 | 46 |
| 1996 | 47 |
| 1997 | 52 |
| 1998 | 51 |
| 1999 | 55 |
| 2000 | 59 |
| 2001 | 74 |
| 2002 | 87 |
| 2003 | 83 |
| 2004 | 65 |
| 2005 | 82 |
| 2006 | 59 |
| 2007 | 101 |
| 2008 | 90 |
| 2009 | 128 |
| 2010 | 131 |
| 2011 | 97 |
| 2012 | 105 |
| 2013 | 123 |
| 2014 | 139 |
| 2015 | 111 |
| 2016 | 197 |
| 2017 | 211 |
| 2018 | 232 |
| 2019 | 223 |
| 2020 | 166 |
| 2021 | 159 |
| 2022 | 178 |
| 2023 | 190 |
| 2024 | 205 |