85% (1966)

80% (1965)

70% (1972)

78% (1976)

64% (1976)

65% (1974)

62% (1969)

69% (1971)

73% (1967)

68% (1969)

63% (1972)

69% (1968)

66% (1972)

70% (1976)

67% (1969)

60% (1971)

68% (1976)

65% (1972)

69% (1986)

70% (1972)