88% (1994)

86% (1999)

67% (2011)

68% (2004)

80% (1995)

81% (2010)

66% (2000)

73% (2007)

64% (2002)

56% (1998)

56% (1996)

79% (2004)

74% (1989)

78% (1990)

58% (2005)

64% (2010)

67% (2007)

67% (1997)

68% (2007)

57% (2003)