67% (2009)

64% (2008)

63% (2010)

64% (2000)

62% (2002)

58% (2012)

65% (1997)

54% (1998)

64% (1999)

63% (1998)

58% (2008)

66% (1999)

69% (2012)

70% (1998)

70% (2000)

56% (1997)

62% (1997)

60% (2004)

58% (2000)

63% (1999)