83% (1994)

76% (2000)

74% (1989)

80% (1998)

78% (1991)

77% (1992)

76% (1997)

76% (2002)

75% (1999)

73% (2003)

76% (2002)

66% (2000)

72% (1996)

59% (2005)

69% (1995)

61% (2004)

71% (2001)

68% (1988)

70% (1995)

75% (2006)