| Year | Count |
|---|---|
| 1970 | 60 |
| 1971 | 351 |
| 1972 | 633 |
| 1973 | 534 |
| 1974 | 622 |
| 1975 | 622 |
| 1976 | 692 |
| 1977 | 857 |
| 1978 | 787 |
| 1979 | 826 |
| 1980 | 880 |
| 1981 | 756 |
| 1982 | 813 |
| 1983 | 776 |
| 1984 | 702 |
| 1985 | 762 |
| 1986 | 797 |
| 1987 | 844 |
| 1988 | 714 |
| 1989 | 689 |
| 1989 | 7 |
| 1990 | 742 |
| 1991 | 907 |
| 1992 | 802 |
| 1993 | 705 |
| 1994 | 709 |
| 1995 | 513 |
| 1996 | 482 |
| 1997 | 299 |
| 1998 | 269 |
| 1999 | 152 |
| 2000 | 124 |
| 2001 | 109 |
| 2002 | 80 |
| 2003 | 85 |
| 2004 | 100 |
| 2005 | 101 |
| 2006 | 112 |
| 2007 | 89 |
| 2008 | 98 |
| 2009 | 37 |
| 2010 | 81 |
| 2011 | 48 |
| 2012 | 31 |
| 2013 | 15 |
| 2014 | 24 |
| 2015 | 52 |
| 2016 | 42 |
| 2017 | 21 |
| 2018 | 12 |
| 2019 | 18 |
| 2022 | 10 |
| 2024 | 10 |