79% (1993)

76% (2006)

75% (1990)

83% (2006)

72% (2009)

77% (2002)

65% (2004)

60% (1999)

71% (1997)

67% (2005)

70% (2001)

69% (2006)

65% (2014)

68% (1998)

75% (1999)

71% (1997)

62% (2011)

68% (1997)

64% (2002)

67% (2002)