84% (2004)

83% (1997)

81% (1988)

79% (1989)

80% (1986)

80% (1995)

72% (2002)

78% (1992)

74% (1991)

64% (1994)

78% (1985)

73% (1993)

75% (2000)

82% (1993)

51% (1987)

72% (1985)

63% (1986)

66% (2013)

78% (1988)

50% (2014)