| Year | Count |
|---|---|
| 1964 | 5 |
| 1973 | 10 |
| 1974 | 24 |
| 1975 | 31 |
| 1976 | 40 |
| 1977 | 25 |
| 1978 | 21 |
| 1979 | 68 |
| 1980 | 6 |
| 1981 | 7 |
| 1982 | 18 |
| 1983 | 11 |
| 1985 | 10 |
| 1986 | 30 |
| 1987 | 6 |
| 1988 | 34 |
| 1989 | 7 |
| 1990 | 34 |
| 1991 | 58 |
| 1992 | 88 |
| 1993 | 115 |
| 1994 | 121 |
| 1995 | 271 |
| 1996 | 132 |
| 1997 | 144 |
| 1998 | 153 |
| 1999 | 169 |
| 2000 | 181 |
| 2001 | 178 |
| 2002 | 153 |
| 2003 | 165 |
| 2004 | 195 |
| 2005 | 193 |
| 2006 | 245 |
| 2007 | 238 |
| 2008 | 265 |
| 2009 | 305 |
| 2010 | 248 |
| 2011 | 377 |
| 2012 | 418 |
| 2013 | 369 |
| 2014 | 332 |
| 2015 | 435 |
| 2016 | 1,060 |
| 2017 | 1,064 |
| 2018 | 1,136 |
| 2019 | 2,036 |
| 2020 | 1,775 |
| 2021 | 2,019 |
| 2022 | 1,867 |
| 2023 | 2,379 |
| 2024 | 1,885 |