57% (1974)

69% (1972)

69% (1971)

60% (1965)

62% (1966)

64% (1965)

60% (1967)

59% (1981)

54% (1977)

64% (1971)

50% (1976)

63% (1973)

65% (1974)

60% (1972)

54% (1974)

50% (1967)

57% (1965)

61% (1974)

60% (1973)

53% (1970)