63% (1973)

61% (1974)

58% (1976)

42% (1971)

56% (1969)

62% (1969)

50% (1975)

44% (1967)

58% (1976)

54% (1967)

73% (1967)

52% (1969)

59% (1967)

50% (1972)

57% (1968)

50% (1969)

70% (1967)

50% (1970)

55% (1968)

50% (1968)