Year	Percent
1948	4
1949	4
1950	4
1951	4
1952	4
1953	4
1954	4
1955	4
1956	4
1957	4
1958	4
1959	4
1960	6
1961	6
1962	6
1963	4
1964	4
1965	4
1966	5
1967	5
1968	7
1969	8
1970	8
1971	7
1972	8
1973	9
1974	9
1975	8
1976	8
1977	8
1978	10
1979	9
2003	12