76% (1980)

72% (1989)

66% (1982)

66% (1990)

72% (1976)

63% (1983)

61% (1986)

56% (1999)

72% (1966)

65% (1987)

70% (1973)

56% (1980)

72% (1968)

58% (1979)

63% (1978)

61% (1996)

64% (1990)

61% (1979)

71% (1972)

59% (1980)