61% (2008)

63% (2005)

68% (2011)

60% (1997)

63% (2003)

55% (2008)

59% (2000)

62% (2005)

76% (2001)

71% (2004)

64% (2002)

61% (2000)

56% (2000)

65% (2000)

61% (2003)

50% (2003)

54% (1999)

63% (1991)