65% (1961)

71% (1974)

71% (1971)

83% (1975)

75% (1962)

57% (1976)

70% (1983)

80% (1969)

35% (1968)

78% (1980)

71% (1985)

90% (1990)

63% (1974)

64% (1980)

71% (1983)

78% (1973)

63% (1988)

0% (1975)

60% (1984)

77% (1989)