61% (1973)

69% (1972)

70% (1971)

61% (1972)

57% (1974)

54% (1977)

54% (1974)

64% (1973)

62% (1966)

57% (1965)

64% (1965)

64% (1971)

62% (1967)

58% (1967)

66% (1974)

51% (1976)

60% (1981)

43% (1966)

60% (1965)

54% (1971)