85% (1966)

70% (1972)

80% (1965)

69% (1971)

73% (1967)

64% (1976)

63% (1972)

79% (1976)

63% (1968)

66% (1972)

69% (1968)

70% (1976)

65% (1974)

70% (1972)

66% (1976)

65% (1972)

62% (1969)

67% (1969)

60% (1971)

63% (1970)