71% (1974)

65% (1961)

75% (1962)

71% (1971)

83% (1975)

65% (1976)

80% (1969)

63% (1988)

69% (1975)

78% (1973)

60% (1984)

57% (1976)

35% (1968)

90% (1990)

55% (1987)

0% (1975)

78% (1980)

70% (1983)

64% (1980)

28% (1977)