79% (1993)

72% (2009)

82% (2006)

76% (2006)

75% (1990)

77% (2002)

70% (2001)

60% (1999)

70% (1997)

68% (2002)

71% (2000)

64% (2014)

76% (1988)

69% (1998)

63% (2004)

71% (1997)

67% (1997)

64% (2002)

65% (2000)

65% (2004)