64% (2013)

56% (1996)

62% (2006)

57% (1989)

64% (2003)

56% (1995)

65% (1987)

54% (2002)

62% (1997)

62% (1995)

56% (2004)

53% (1988)

70% (1990)

62% (1998)

60% (2006)

58% (1993)

69% (2005)

0% (1970)

66% (2006)

43% (1995)