Year	Percent
1948	2
1949	2
1950	2
1951	2
1952	2
1953	2
1954	2
1955	2
1956	2
1957	2
1958	2
1959	5
1960	5
1961	5
1962	5
1963	5
1964	5
1965	5
1966	5
1967	5
1968	5
1969	6
1970	5
1971	5
1972	5
1973	5
1974	5
1975	7
1976	7
1977	7
1978	8
1979	11
1980	13
1981	14
1982	13
1983	11
1984	11
1985	8
1986	8
1987	8
1988	8
1989	45
1990	43
1991	43
1992	52
1993	71
1994	48
1995	49
1996	45
1997	45
1998	60
1999	38
2000	38
2001	37
2002	40
2003	29
2004	29
2005	29
2006	29