| Year | Count |
|---|---|
| 1958 | 12 |
| 1970 | 5 |
| 1974 | 9 |
| 1975 | 7 |
| 1976 | 14 |
| 1977 | 16 |
| 1978 | 20 |
| 1979 | 30 |
| 1980 | 30 |
| 1981 | 8 |
| 1982 | 7 |
| 1983 | 14 |
| 1984 | 13 |
| 1985 | 12 |
| 1986 | 14 |
| 1987 | 28 |
| 1988 | 15 |
| 1989 | 25 |
| 1990 | 19 |
| 1991 | 22 |
| 1992 | 24 |
| 1993 | 20 |
| 1994 | 21 |
| 1995 | 31 |
| 1996 | 27 |
| 1997 | 28 |
| 1998 | 32 |
| 1999 | 34 |
| 2000 | 42 |
| 2001 | 32 |
| 2002 | 47 |
| 2003 | 51 |
| 2004 | 43 |
| 2005 | 49 |
| 2006 | 42 |
| 2007 | 64 |
| 2008 | 77 |
| 2009 | 57 |
| 2010 | 51 |
| 2011 | 79 |
| 2012 | 85 |
| 2013 | 80 |
| 2014 | 88 |
| 2015 | 65 |
| 2016 | 207 |
| 2017 | 228 |
| 2018 | 234 |
| 2019 | 142 |
| 2020 | 125 |
| 2021 | 177 |
| 2022 | 130 |
| 2023 | 160 |
| 2024 | 142 |