59% (1976)

61% (1974)

63% (1973)

50% (1969)

58% (1976)

57% (1969)

54% (1968)

64% (1977)

50% (1968)

50% (1977)

42% (1971)

54% (1967)

58% (1972)

52% (1969)

44% (1967)

73% (1967)

70% (1967)

63% (1968)

50% (1975)

57% (1968)