63% (1973)

56% (1969)

61% (1974)

58% (1976)

42% (1971)

58% (1976)

55% (1968)

50% (1973)

64% (1977)

0% (1974)

73% (1967)

57% (1968)

52% (1969)

59% (1967)

54% (1967)

62% (1969)

70% (1967)

58% (1967)

63% (1976)

50% (1975)