| Year | Count |
|---|---|
| 1962 | 5 |
| 1973 | 5 |
| 1978 | 5 |
| 1979 | 29 |
| 1980 | 17 |
| 1981 | 19 |
| 1982 | 13 |
| 1983 | 12 |
| 1984 | 18 |
| 1985 | 16 |
| 1986 | 19 |
| 1987 | 39 |
| 1988 | 33 |
| 1989 | 19 |
| 1990 | 29 |
| 1990 | 10 |
| 1991 | 49 |
| 1992 | 13 |
| 1993 | 39 |
| 1994 | 34 |
| 1995 | 66 |
| 1996 | 62 |
| 1997 | 41 |
| 1998 | 73 |
| 1998 | 10 |
| 1999 | 164 |
| 2000 | 157 |
| 2001 | 99 |
| 2002 | 114 |
| 2003 | 203 |
| 2004 | 270 |
| 2005 | 208 |
| 2005 | 5 |
| 2006 | 158 |
| 2007 | 164 |
| 2008 | 138 |
| 2009 | 94 |
| 2010 | 199 |
| 2011 | 387 |
| 2012 | 380 |
| 2013 | 332 |
| 2014 | 245 |
| 2015 | 194 |
| 2016 | 119 |
| 2017 | 90 |
| 2018 | 108 |
| 2019 | 76 |
| 2020 | 73 |
| 2021 | 81 |
| 2022 | 32 |
| 2023 | 25 |
| 2024 | 25 |