65% (1961)

71% (1974)

75% (1962)

83% (1975)

70% (1983)

81% (1968)

71% (1971)

35% (1968)

81% (1969)

64% (1980)

71% (1983)

56% (1976)

71% (1985)

78% (1973)

78% (1980)

90% (1990)

43% (1975)

70% (1984)

28% (1977)

63% (1988)