| Year | Count |
|---|---|
| 1974 | 7 |
| 1978 | 5 |
| 1979 | 10 |
| 1980 | 27 |
| 1981 | 9 |
| 1982 | 24 |
| 1983 | 11 |
| 1984 | 15 |
| 1985 | 50 |
| 1986 | 41 |
| 1987 | 20 |
| 1988 | 60 |
| 1989 | 38 |
| 1990 | 73 |
| 1991 | 79 |
| 1992 | 60 |
| 1993 | 107 |
| 1994 | 185 |
| 1995 | 271 |
| 1996 | 323 |
| 1997 | 300 |
| 1998 | 388 |
| 1999 | 578 |
| 2000 | 633 |
| 2001 | 780 |
| 2002 | 756 |
| 2003 | 772 |
| 2004 | 732 |
| 2005 | 782 |
| 2006 | 739 |
| 2007 | 698 |
| 2008 | 819 |
| 2009 | 780 |
| 2010 | 859 |
| 2011 | 766 |
| 2012 | 803 |
| 2013 | 887 |
| 2014 | 892 |
| 2015 | 1,088 |
| 2016 | 1,053 |
| 2017 | 971 |
| 2018 | 1,229 |
| 2019 | 1,060 |
| 2020 | 974 |
| 2021 | 1,155 |
| 2022 | 1,111 |
| 2023 | 1,056 |
| 2024 | 1,119 |