61% (1972)

69% (1972)

69% (1971)

60% (1965)

51% (1976)

56% (1974)

56% (1971)

57% (1965)

54% (1977)

61% (1967)

64% (1965)

61% (1973)

62% (1974)

60% (1981)

61% (1966)

66% (1974)

63% (1971)

64% (1969)

54% (1974)

63% (1973)