61% (1998)

68% (1986)

66% (2007)

61% (1998)

61% (1988)

73% (1987)

62% (1990)

64% (2002)

57% (2005)

62% (2008)

61% (2004)

74% (1999)

69% (2004)

62% (1998)

62% (1990)

57% (1992)

67% (1999)

65% (1991)

72% (2010)

67% (2001)