| Year | Count |
|---|---|
| 1966 | 7 |
| 1968 | 6 |
| 1969 | 11 |
| 1974 | 6 |
| 1975 | 17 |
| 1976 | 27 |
| 1977 | 25 |
| 1978 | 17 |
| 1979 | 25 |
| 1980 | 373 |
| 1981 | 107 |
| 1982 | 60 |
| 1983 | 88 |
| 1984 | 80 |
| 1985 | 22 |
| 1986 | 10 |
| 1987 | 8 |
| 1988 | 27 |
| 1989 | 56 |
| 1990 | 22 |
| 1991 | 14 |
| 1992 | 26 |
| 1993 | 41 |
| 1994 | 114 |
| 1995 | 66 |
| 1996 | 62 |
| 1997 | 92 |
| 1998 | 199 |
| 1999 | 310 |
| 2000 | 389 |
| 2001 | 498 |
| 2002 | 549 |
| 2003 | 582 |
| 2004 | 735 |
| 2005 | 861 |
| 2006 | 880 |
| 2007 | 1,016 |
| 2008 | 963 |
| 2009 | 908 |
| 2010 | 769 |
| 2011 | 787 |
| 2012 | 862 |
| 2013 | 702 |
| 2014 | 618 |
| 2015 | 621 |
| 2016 | 562 |
| 2017 | 535 |
| 2018 | 397 |
| 2019 | 413 |
| 2020 | 404 |
| 2021 | 565 |
| 2022 | 664 |
| 2023 | 733 |
| 2024 | 805 |