77% (2005)

58% (1988)

71% (1995)

66% (1995)

70% (1991)

67% (1999)

74% (2002)

62% (1992)

70% (2004)

76% (1995)

68% (2008)

68% (2007)

65% (2003)

69% (1999)

60% (2003)

68% (2001)

67% (2004)

67% (2001)

78% (1991)

58% (2003)