88% (1994)

86% (1999)

80% (1995)

78% (1990)

67% (2011)

65% (2000)

67% (2004)

55% (1996)

79% (2004)

58% (2005)

74% (1989)

67% (1997)

73% (2007)

64% (2002)

64% (1990)

67% (2007)

64% (1991)

63% (2010)

56% (2003)

76% (2013)