74% (1978)

64% (1990)

73% (1978)

62% (1986)

72% (1992)

67% (1990)

71% (1993)

62% (2008)

66% (1990)

63% (1980)

55% (1987)

72% (1979)

77% (1982)

33% (1978)

58% (1991)

63% (1982)

54% (1981)

66% (1979)

52% (1982)

65% (1997)