| Year | Count |
|---|---|
| 1976 | 5 |
| 1977 | 10 |
| 1978 | 5 |
| 1979 | 7 |
| 1980 | 25 |
| 1981 | 5 |
| 1982 | 13 |
| 1983 | 5 |
| 1985 | 25 |
| 1986 | 25 |
| 1987 | 70 |
| 1988 | 112 |
| 1989 | 111 |
| 1990 | 103 |
| 1991 | 119 |
| 1992 | 105 |
| 1993 | 84 |
| 1994 | 121 |
| 1995 | 123 |
| 1996 | 75 |
| 1997 | 98 |
| 1998 | 34 |
| 1999 | 72 |
| 2000 | 73 |
| 2001 | 62 |
| 2002 | 51 |
| 2003 | 41 |
| 2004 | 61 |
| 2005 | 6 |
| 2006 | 28 |
| 2007 | 34 |
| 2008 | 25 |
| 2009 | 54 |
| 2010 | 27 |
| 2011 | 55 |
| 2012 | 50 |
| 2014 | 10 |
| 2015 | 10 |
| 2016 | 20 |
| 2017 | 5 |
| 2019 | 5 |
| 2020 | 7 |
| 2023 | 10 |
| 2024 | 5 |