61% (2010)

63% (2007)

58% (2000)

66% (2006)

65% (2003)

57% (2007)

58% (2006)

59% (1999)

66% (1998)

56% (2002)

62% (2004)

65% (1998)

51% (2000)

40% (2001)

0% (1970)

0% (1970)

82% (2001)