Year	Number of
1980	0
1981	2
1982	8
1983	0
1984	0
1985	0
1986	8
1987	6
1988	8
1989	0
1990	7
1994	4
1999	2
2000	4
2001	3
2002	5
2003	3
2005	11
2006	12
2007	3