56% (1987)

74% (1978)

63% (1990)

73% (1978)

63% (1986)

66% (1990)

62% (2008)

71% (1993)

67% (1990)

63% (1982)

72% (1992)

76% (1982)

50% (1976)

72% (1979)

58% (1991)

66% (1997)

64% (1980)

62% (1995)

33% (1978)

65% (1979)