Year	Percent
1948	6
1949	6
1950	6
1951	6
1952	6
1953	6
1954	6
1955	6
1956	6
1957	6
1958	6
1959	10
1960	10
1961	10
1962	10
1963	10
1964	10
1965	10
1966	10
1967	10
1968	10
1969	10
1970	10
1971	10
1972	10
1973	10
1974	10
1975	10
1976	13
1977	15
1978	29
1979	30
1980	30
1981	45
1982	45
1983	60
1984	60
1985	43
1986	36
1987	30
1988	748
1989	866
1990	290
1991	68
1992	48
1993	29
1994	16
1995	18
1996	18
1997	16
1998	19
1999	18
2000	14
2001	5
2002	5
2003	3
2004	4
2005	4
2006	5