63% (1973)

58% (1976)

61% (1974)

42% (1971)

56% (1969)

62% (1969)

73% (1967)

50% (1969)

50% (1975)

50% (1968)

54% (1967)

59% (1967)

57% (1968)

50% (1970)

52% (1969)

58% (1976)

44% (1967)

58% (1967)

50% (1970)

70% (1967)