76% (2006)

72% (2009)

75% (1990)

82% (2006)

78% (1993)

77% (2002)

69% (2001)

60% (1999)

69% (1998)

68% (1997)

64% (2014)

62% (2011)

76% (1988)

64% (2002)

67% (2008)

71% (2000)

61% (2009)

65% (2009)

67% (2005)

63% (2004)