79% (2001)

73% (2001)

72% (1992)

78% (1999)

65% (2000)

56% (1994)

71% (1994)

74% (1997)

72% (1996)

72% (2004)

69% (2011)

69% (1995)

58% (2000)

66% (1996)

54% (1992)

68% (2000)

66% (2002)

46% (1994)

57% (1996)

54% (2001)