84% (2004)

81% (1988)

84% (1997)

78% (1989)

80% (1984)

80% (1995)

80% (1986)

72% (2002)

78% (1992)

64% (1993)

71% (1999)

74% (1991)

77% (2000)

78% (1985)

73% (1993)

58% (1987)

61% (1986)

82% (1993)

61% (1989)

67% (2013)