| Year | Count |
|---|---|
| 1963 | 5 |
| 1965 | 5 |
| 1970 | 5 |
| 1971 | 23 |
| 1972 | 21 |
| 1973 | 21 |
| 1974 | 18 |
| 1975 | 6 |
| 1975 | 39 |
| 1976 | 59 |
| 1977 | 71 |
| 1978 | 70 |
| 1979 | 54 |
| 1980 | 25 |
| 1981 | 51 |
| 1982 | 19 |
| 1983 | 30 |
| 1984 | 27 |
| 1985 | 48 |
| 1986 | 14 |
| 1987 | 25 |
| 1988 | 25 |
| 1989 | 36 |
| 1990 | 35 |
| 1991 | 34 |
| 1992 | 39 |
| 1993 | 47 |
| 1994 | 22 |
| 1995 | 36 |
| 1996 | 52 |
| 1997 | 71 |
| 1998 | 73 |
| 1999 | 55 |
| 2000 | 59 |
| 2001 | 78 |
| 2002 | 55 |
| 2003 | 94 |
| 2004 | 91 |
| 2005 | 77 |
| 2006 | 76 |
| 2007 | 69 |
| 2008 | 124 |
| 2009 | 127 |
| 2010 | 115 |
| 2011 | 70 |
| 2012 | 128 |
| 2013 | 155 |
| 2014 | 150 |
| 2015 | 164 |
| 2016 | 251 |
| 2017 | 177 |
| 2018 | 172 |
| 2019 | 144 |
| 2020 | 118 |
| 2021 | 230 |
| 2022 | 278 |
| 2023 | 290 |
| 2024 | 244 |