83% (1994)

77% (1992)

77% (1991)

80% (1998)

75% (2002)

76% (2000)

74% (1989)

75% (1997)

73% (2003)

74% (1999)

76% (2002)

59% (2005)

61% (2004)

71% (1996)

70% (1995)

65% (2000)

70% (2001)

67% (1988)

70% (1995)

76% (2006)