| Year | Count |
|---|---|
| 1961 | 5 |
| 1965 | 5 |
| 1968 | 5 |
| 1969 | 5 |
| 1970 | 12 |
| 1971 | 5 |
| 1973 | 7 |
| 1974 | 5 |
| 1977 | 10 |
| 1978 | 10 |
| 1987 | 27 |
| 1988 | 7 |
| 1989 | 15 |
| 1991 | 39 |
| 1992 | 46 |
| 1993 | 53 |
| 1994 | 15 |
| 1995 | 45 |
| 1996 | 43 |
| 1997 | 7 |
| 1998 | 61 |
| 1999 | 42 |
| 2000 | 25 |
| 2001 | 62 |
| 2002 | 27 |
| 2003 | 26 |
| 2004 | 124 |
| 2005 | 91 |
| 2006 | 144 |
| 2007 | 195 |
| 2008 | 293 |
| 2009 | 268 |
| 2010 | 479 |
| 2011 | 622 |
| 2012 | 728 |
| 2013 | 814 |
| 2014 | 883 |
| 2015 | 1,093 |
| 2016 | 1,453 |
| 2017 | 1,629 |
| 2018 | 1,915 |
| 2019 | 1,786 |
| 2020 | 1,735 |
| 2021 | 2,269 |
| 2022 | 2,452 |
| 2023 | 2,235 |
| 2024 | 2,163 |