64% (1974)

0% (1965)

51% (1970)

56% (1975)

60% (1966)

58% (1977)

61% (1965)

62% (1964)

37% (1970)

53% (1971)

64% (1977)

61% (1963)

63% (1964)

64% (1969)

55% (1961)

56% (1972)

55% (1967)

48% (1960)

65% (1968)

62% (1966)