| Year | Count |
|---|---|
| 1958 | 8 |
| 1959 | 5 |
| 1969 | 5 |
| 1970 | 8 |
| 1972 | 7 |
| 1973 | 8 |
| 1974 | 10 |
| 1976 | 5 |
| 1977 | 9 |
| 1978 | 9 |
| 1979 | 7 |
| 1980 | 16 |
| 1981 | 15 |
| 1982 | 15 |
| 1983 | 8 |
| 1984 | 17 |
| 1985 | 20 |
| 1986 | 16 |
| 1987 | 23 |
| 1988 | 16 |
| 1989 | 21 |
| 1990 | 18 |
| 1991 | 32 |
| 1992 | 39 |
| 1993 | 27 |
| 1994 | 37 |
| 1995 | 31 |
| 1996 | 40 |
| 1997 | 35 |
| 1998 | 46 |
| 1999 | 27 |
| 2000 | 40 |
| 2001 | 43 |
| 2002 | 44 |
| 2003 | 49 |
| 2004 | 54 |
| 2005 | 66 |
| 2006 | 67 |
| 2007 | 77 |
| 2008 | 80 |
| 2009 | 109 |
| 2010 | 73 |
| 2011 | 92 |
| 2012 | 91 |
| 2013 | 95 |
| 2014 | 79 |
| 2015 | 101 |
| 2016 | 182 |
| 2017 | 194 |
| 2018 | 222 |
| 2019 | 181 |
| 2020 | 110 |
| 2021 | 108 |
| 2022 | 127 |
| 2023 | 116 |
| 2024 | 151 |