78% (1993)

83% (2006)

76% (2006)

75% (1990)

72% (2009)

77% (2002)

64% (2002)

69% (1998)

60% (1999)

69% (2001)

71% (1997)

65% (2014)

65% (2000)

76% (1988)

65% (2009)

63% (2004)

72% (2000)

65% (2005)

69% (2006)

67% (2008)