64% (1965)

68% (1972)

63% (1971)

44% (1966)

56% (1974)

64% (1969)

50% (1967)

46% (1967)

55% (1971)

61% (1965)

60% (1981)

56% (1965)

54% (1970)

69% (1971)

60% (1972)

61% (1966)

54% (1977)

61% (1967)

51% (1972)

65% (1974)