81% (1976)

72% (1981)

82% (1979)

69% (1985)

71% (1967)

58% (1984)

78% (1965)

60% (1984)

45% (1983)

63% (1950)

71% (1968)

62% (1969)

67% (1986)

56% (1970)

55% (1981)

62% (1972)

73% (1966)

73% (1965)

71% (1984)

50% (1978)