73% (1982)

73% (2002)

59% (1991)

72% (1979)

77% (1981)

76% (1986)

61% (1997)

76% (1981)

65% (1989)

64% (1995)

74% (1984)

46% (1988)

77% (1985)

68% (1975)

80% (1973)

66% (1972)

72% (1977)

68% (1979)

70% (1982)

85% (1988)