70% (1974)

71% (1971)

80% (1969)

57% (1976)

65% (1961)

78% (1980)

90% (1990)

60% (1984)

70% (1983)

63% (1988)

78% (1973)

69% (1984)

60% (1969)

69% (1975)

81% (1980)

63% (1974)

35% (1968)

65% (1982)

43% (1975)

70% (1983)