61% (1972)

69% (1972)

64% (1971)

64% (1965)

57% (1974)

51% (1976)

61% (1966)

43% (1966)

60% (1973)

57% (1965)

62% (1974)

63% (1966)

70% (1971)

62% (1967)

54% (1977)

58% (1967)

60% (1965)

50% (1967)

64% (1973)

60% (1981)