0% (1970)

56% (1999)

68% (1997)

75% (1996)

49% (1999)

60% (2006)

53% (2003)

66% (1998)

67% (1999)

69% (1996)

66% (2002)

69% (2002)

65% (2002)

58% (2009)

53% (2002)

63% (2005)

61% (2000)

59% (1996)

66% (1997)

56% (1993)