67% (1996)

61% (2010)

65% (2003)

67% (2006)

70% (1996)

58% (2006)

56% (2002)

63% (2012)

66% (1998)

63% (2007)

65% (1998)

62% (2004)

51% (2000)

45% (2001)

0% (1970)

0% (1970)

82% (2001)