88% (1994)

68% (2004)

86% (1999)

64% (2010)

67% (2011)

78% (1990)

73% (2007)

56% (1996)

74% (1989)

53% (2003)

66% (2000)

80% (1995)

79% (2004)

66% (2007)

58% (2005)

67% (1997)

65% (2007)

64% (1990)

63% (1993)

57% (2003)