67% (2009)

62% (2002)

64% (2000)

64% (2008)

65% (1997)

63% (2010)

59% (2012)

57% (2000)

66% (1999)

64% (1999)

56% (1986)

58% (2008)

69% (2012)

70% (2000)

70% (1998)

56% (1997)

59% (2008)

58% (2000)

60% (2004)

61% (2002)