| Year | Count |
|---|---|
| 1962 | 6 |
| 1973 | 7 |
| 1976 | 10 |
| 1977 | 12 |
| 1982 | 7 |
| 1983 | 5 |
| 1984 | 5 |
| 1986 | 6 |
| 1987 | 6 |
| 1989 | 5 |
| 1992 | 7 |
| 1994 | 7 |
| 1995 | 7 |
| 1996 | 25 |
| 1997 | 17 |
| 1998 | 6 |
| 1999 | 30 |
| 2000 | 5 |
| 2001 | 18 |
| 2002 | 5 |
| 2003 | 40 |
| 2004 | 58 |
| 2005 | 81 |
| 2006 | 84 |
| 2007 | 47 |
| 2008 | 102 |
| 2009 | 134 |
| 2010 | 119 |
| 2011 | 101 |
| 2012 | 98 |
| 2013 | 65 |
| 2014 | 120 |
| 2015 | 156 |
| 2016 | 158 |
| 2017 | 211 |
| 2018 | 113 |
| 2019 | 112 |
| 2020 | 140 |
| 2021 | 173 |
| 2022 | 146 |
| 2023 | 165 |
| 2024 | 219 |