| Year | Count |
|---|---|
| 1970 | 5 |
| 1981 | 7 |
| 1982 | 5 |
| 1983 | 19 |
| 1984 | 16 |
| 1985 | 16 |
| 1986 | 5 |
| 1987 | 20 |
| 1988 | 25 |
| 1989 | 39 |
| 1990 | 11 |
| 1991 | 50 |
| 1992 | 65 |
| 1993 | 38 |
| 1994 | 5 |
| 1994 | 27 |
| 1995 | 48 |
| 1996 | 45 |
| 1997 | 74 |
| 1998 | 61 |
| 1999 | 52 |
| 2000 | 52 |
| 2001 | 78 |
| 2002 | 77 |
| 2003 | 94 |
| 2004 | 120 |
| 2005 | 10 |
| 2005 | 132 |
| 2006 | 119 |
| 2007 | 94 |
| 2008 | 139 |
| 2009 | 94 |
| 2010 | 101 |
| 2011 | 120 |
| 2012 | 74 |
| 2013 | 127 |
| 2014 | 120 |
| 2015 | 134 |
| 2016 | 182 |
| 2017 | 189 |
| 2018 | 142 |
| 2019 | 72 |
| 2020 | 79 |
| 2021 | 108 |
| 2022 | 84 |
| 2023 | 116 |
| 2024 | 123 |