Year	Percent
1965	5
1966	5
1967	5
1968	5
1969	5
1970	5
1971	5
1972	5
1973	5
1974	5
1975	5
1976	5
1977	6
1978	6
1979	7
1980	7
1981	8
1982	8
1983	10
1984	15
1985	25
1986	30
1987	15
1988	15
1992	47
1993	73
1994	21
1995	40
1996	47
1997	18
1999	33
2000	26
2001	40
2002	28
2003	14
2004	17
2005	15
2006	9