| Year | Count |
|---|---|
| 1978 | 5 |
| 1979 | 5 |
| 1981 | 5 |
| 1983 | 10 |
| 1986 | 10 |
| 1987 | 5 |
| 1989 | 7 |
| 1990 | 6 |
| 1991 | 13 |
| 1992 | 23 |
| 1993 | 50 |
| 1994 | 26 |
| 1995 | 58 |
| 1996 | 75 |
| 1997 | 67 |
| 1998 | 75 |
| 1999 | 75 |
| 2000 | 94 |
| 2001 | 63 |
| 2002 | 42 |
| 2003 | 70 |
| 2004 | 57 |
| 2005 | 41 |
| 2006 | 73 |
| 2007 | 65 |
| 2008 | 53 |
| 2009 | 56 |
| 2010 | 66 |
| 2011 | 66 |
| 2012 | 30 |
| 2013 | 40 |
| 2014 | 38 |
| 2015 | 30 |
| 2016 | 21 |
| 2018 | 39 |
| 2019 | 26 |
| 2020 | 19 |
| 2021 | 43 |
| 2022 | 10 |
| 2023 | 7 |
| 2024 | 22 |