74% (2002)

71% (1992)

59% (2004)

61% (1999)

76% (1986)

71% (1988)

73% (1994)

77% (1999)

71% (1979)

77% (1986)

47% (1984)

68% (1989)

70% (2002)

78% (1969)

61% (1974)

60% (1972)

58% (1983)

61% (1982)

70% (1995)

61% (1995)