| Year | Count |
|---|---|
| 1974 | 7 |
| 1977 | 6 |
| 1978 | 13 |
| 1979 | 6 |
| 1980 | 13 |
| 1981 | 21 |
| 1982 | 8 |
| 1983 | 22 |
| 1984 | 24 |
| 1985 | 78 |
| 1986 | 69 |
| 1987 | 75 |
| 1987 | 5 |
| 1988 | 69 |
| 1988 | 15 |
| 1989 | 80 |
| 1989 | 20 |
| 1990 | 125 |
| 1990 | 34 |
| 1991 | 88 |
| 1991 | 110 |
| 1992 | 155 |
| 1992 | 118 |
| 1993 | 116 |
| 1993 | 92 |
| 1994 | 43 |
| 1994 | 77 |
| 1995 | 61 |
| 1995 | 57 |
| 1996 | 82 |
| 1996 | 31 |
| 1997 | 9 |
| 1997 | 48 |
| 1998 | 13 |
| 1998 | 10 |
| 1999 | 20 |
| 1999 | 16 |
| 2000 | 16 |
| 2001 | 27 |
| 2001 | 10 |
| 2004 | 14 |
| 2007 | 11 |
| 2008 | 7 |
| 2010 | 5 |
| 2011 | 6 |
| 2014 | 5 |
| 2015 | 5 |
| 2015 | 12 |
| 2016 | 5 |
| 2017 | 6 |
| 2018 | 12 |
| 2019 | 13 |
| 2020 | 5 |
| 2022 | 15 |
| 2023 | 11 |
| 2024 | 5 |