| Year | Count |
|---|---|
| 1978 | 14 |
| 1981 | 5 |
| 1982 | 5 |
| 1984 | 6 |
| 1985 | 8 |
| 1986 | 9 |
| 1987 | 10 |
| 1988 | 7 |
| 1988 | 7 |
| 1989 | 5 |
| 1990 | 11 |
| 1991 | 17 |
| 1991 | 6 |
| 1992 | 22 |
| 1993 | 28 |
| 1993 | 5 |
| 1994 | 51 |
| 1995 | 50 |
| 1996 | 52 |
| 1997 | 61 |
| 1998 | 55 |
| 1999 | 57 |
| 2000 | 70 |
| 2001 | 69 |
| 2001 | 5 |
| 2002 | 77 |
| 2003 | 77 |
| 2004 | 65 |
| 2005 | 62 |
| 2006 | 62 |
| 2007 | 64 |
| 2008 | 72 |
| 2009 | 50 |
| 2010 | 65 |
| 2011 | 105 |
| 2012 | 99 |
| 2013 | 107 |
| 2013 | 5 |
| 2014 | 102 |
| 2015 | 86 |
| 2016 | 258 |
| 2017 | 237 |
| 2018 | 225 |
| 2019 | 148 |
| 2020 | 160 |
| 2021 | 122 |
| 2022 | 122 |
| 2023 | 88 |
| 2024 | 60 |