68% (1981)

87% (2002)

86% (2000)

72% (2011)

80% (1995)

71% (1994)

43% (2002)

79% (2003)

73% (1978)

40% (2001)

80% (1998)

65% (2001)

81% (1999)

61% (2005)

82% (2002)

77% (1968)

93% (2005)

0% (2006)

61% (2003)

74% (2011)