75% (2008)

67% (1993)

74% (1995)

62% (1995)

69% (2003)

72% (1999)

72% (1985)

73% (1982)

69% (1989)

68% (2007)

63% (2011)

65% (1999)

66% (1998)

64% (2005)

61% (1986)

66% (2002)

68% (1990)

71% (1993)

60% (2006)

62% (2006)