| Year | Count |
|---|---|
| 1978 | 5 |
| 1990 | 19 |
| 1991 | 99 |
| 1992 | 62 |
| 1993 | 118 |
| 1994 | 70 |
| 1995 | 67 |
| 1996 | 75 |
| 1997 | 72 |
| 1998 | 23 |
| 1999 | 54 |
| 2000 | 34 |
| 2001 | 39 |
| 2002 | 20 |
| 2003 | 48 |
| 2004 | 40 |
| 2005 | 21 |
| 2006 | 43 |
| 2007 | 22 |
| 2008 | 20 |
| 2009 | 23 |
| 2010 | 10 |
| 2011 | 18 |
| 2012 | 34 |
| 2013 | 5 |
| 2014 | 17 |
| 2015 | 21 |
| 2016 | 8 |
| 2017 | 16 |
| 2018 | 6 |
| 2019 | 10 |
| 2020 | 15 |
| 2022 | 21 |