85% (1966)

80% (1965)

64% (1976)

70% (1972)

73% (1967)

69% (1968)

66% (1972)

69% (1971)

79% (1976)

63% (1972)

67% (1969)

70% (1972)

62% (1968)

70% (1976)

66% (1974)

60% (1971)

67% (1969)

68% (1976)

66% (1972)

54% (1963)