63% (2001)

68% (1999)

78% (2004)

74% (1998)

66% (2008)

62% (2009)

69% (1992)

68% (2010)

71% (2006)

60% (1996)

70% (2001)

72% (2005)

66% (1995)

59% (1999)

67% (2010)

40% (2006)

68% (2004)

53% (1998)

64% (1998)

41% (2005)