Year	Number of
1980	20
1981	26
1982	18
1983	16
1984	5
1985	8
1986	35
1987	27
1988	7
1989	13
1990	6
1991	14
1992	13
1993	7
1994	12
1995	8
1996	10
1997	6
1998	5
2002	2
2006	19
2007	3