83% (2006)

71% (2000)

76% (2006)

79% (1993)

68% (1998)

69% (2001)

70% (1997)

75% (1990)

64% (2000)

76% (1988)

68% (1997)

72% (2009)

71% (1997)

75% (2001)

71% (1998)

73% (2002)

69% (2006)

61% (1999)

65% (1996)

69% (1992)