68% (1981)

87% (2002)

86% (2000)

79% (1996)

43% (2002)

72% (2011)

80% (1995)

71% (1994)

73% (1978)

77% (2003)

61% (2004)

61% (2005)

80% (1998)

40% (2001)

74% (2011)

62% (2007)

65% (2001)

78% (2015)

75% (2005)

74% (2010)