Year	Number of
1980	33
1981	18
1982	12
1983	23
1984	9
1985	32
1986	27
1987	22
1988	24
1989	26
1990	23
1991	30
1992	30
1993	28
1994	19
1995	36
1998	18
1999	14
2000	16
2001	16
2002	13
2003	30
2005	12
2006	9
2007	18