67% (2009)

66% (1999)

62% (2002)

70% (2000)

65% (2008)

69% (2012)

51% (1990)

63% (2010)

57% (1997)

65% (2000)

64% (1999)

58% (2012)

57% (2008)

65% (1997)

55% (1986)

57% (2000)

63% (1998)

60% (2004)

69% (1998)

58% (1995)