63% (1971)

71% (1965)

63% (1981)

75% (1973)

65% (1988)

69% (1983)

59% (1968)

70% (1965)

70% (1970)

56% (1986)

73% (1966)

71% (1967)

79% (1969)

79% (1967)

48% (1980)

55% (1974)

73% (1966)

28% (1959)

69% (1975)

76% (1979)