79% (1993)

76% (2006)

83% (2006)

72% (2009)

75% (1990)

60% (1999)

69% (2006)

67% (1999)

75% (1988)

67% (1996)

67% (1997)

77% (2002)

67% (2005)

74% (2002)

65% (2009)

70% (1997)

68% (1998)

69% (2001)

69% (1992)

72% (2000)