| Year | Count |
|---|---|
| 1976 | 64 |
| 1977 | 38 |
| 1978 | 20 |
| 1979 | 12 |
| 1980 | 47 |
| 1981 | 27 |
| 1983 | 10 |
| 1984 | 12 |
| 1985 | 15 |
| 1986 | 10 |
| 1989 | 6 |
| 1990 | 7 |
| 1991 | 26 |
| 1992 | 48 |
| 1993 | 16 |
| 1994 | 35 |
| 1995 | 20 |
| 1996 | 99 |
| 1997 | 124 |
| 1998 | 89 |
| 1999 | 198 |
| 2000 | 201 |
| 2001 | 203 |
| 2002 | 175 |
| 2003 | 200 |
| 2004 | 222 |
| 2005 | 173 |
| 2006 | 153 |
| 2007 | 133 |
| 2008 | 90 |
| 2009 | 45 |
| 2010 | 68 |
| 2011 | 35 |
| 2012 | 78 |
| 2013 | 34 |
| 2014 | 47 |
| 2015 | 61 |
| 2016 | 49 |
| 2017 | 39 |
| 2018 | 58 |
| 2019 | 50 |
| 2020 | 103 |
| 2021 | 59 |
| 2022 | 44 |
| 2023 | 50 |
| 2024 | 40 |