| Year | Count |
|---|---|
| 1976 | 5 |
| 1978 | 5 |
| 1979 | 10 |
| 1979 | 11 |
| 1980 | 56 |
| 1980 | 48 |
| 1981 | 41 |
| 1981 | 20 |
| 1982 | 5 |
| 1982 | 28 |
| 1983 | 38 |
| 1984 | 46 |
| 1985 | 15 |
| 1986 | 37 |
| 1987 | 10 |
| 1987 | 32 |
| 1988 | 31 |
| 1989 | 28 |
| 1990 | 54 |
| 1992 | 28 |
| 1993 | 18 |
| 1994 | 5 |
| 1997 | 8 |
| 1998 | 5 |
| 2000 | 6 |
| 2003 | 10 |
| 2006 | 33 |
| 2007 | 7 |
| 2008 | 12 |
| 2009 | 10 |
| 2010 | 40 |
| 2011 | 17 |
| 2018 | 10 |