| Year | Count |
|---|---|
| 1975 | 9 |
| 1977 | 5 |
| 1978 | 7 |
| 1979 | 7 |
| 1980 | 5 |
| 1981 | 5 |
| 1983 | 7 |
| 1984 | 10 |
| 1985 | 12 |
| 1986 | 31 |
| 1987 | 40 |
| 1988 | 12 |
| 1989 | 23 |
| 1991 | 19 |
| 1992 | 39 |
| 1993 | 28 |
| 1994 | 12 |
| 1995 | 11 |
| 1996 | 35 |
| 1997 | 42 |
| 1998 | 37 |
| 1999 | 6 |
| 2001 | 15 |
| 2002 | 5 |
| 2003 | 6 |
| 2004 | 24 |
| 2005 | 21 |
| 2006 | 8 |
| 2007 | 12 |
| 2008 | 5 |
| 2009 | 10 |
| 2010 | 8 |
| 2011 | 9 |
| 2015 | 6 |
| 2016 | 6 |
| 2017 | 5 |
| 2018 | 79 |
| 2019 | 191 |
| 2020 | 242 |
| 2021 | 296 |
| 2022 | 435 |
| 2023 | 317 |
| 2024 | 388 |