Year	Percent
1983	3
1984	4
1985	4
1986	4
1987	4
1988	6
1989	104
1990	48
1991	36
1992	32
1993	29
1994	28
1995	25
1996	22
1997	25
1998	18
1999	19
2000	22
2001	14
2002	8
2003	6
2004	7
2005	5
2006	4