69% (2003)

56% (2004)

61% (1999)

63% (1997)

57% (2001)

49% (2009)

68% (2006)

71% (2012)

59% (2000)

67% (2005)

57% (1999)

58% (1998)

66% (1999)

50% (2000)

0% (1970)

67% (2012)