83% (1994)

76% (2000)

74% (1989)

77% (1991)

76% (2002)

80% (1998)

74% (1999)

75% (1997)

77% (1992)

71% (1996)

73% (2003)

76% (2002)

65% (2000)

69% (1995)

59% (2005)

61% (2004)

71% (2001)

70% (1995)

67% (1988)

67% (1990)