65% (2009)

63% (2006)

74% (1993)

61% (2003)

59% (2007)

55% (1992)

66% (1992)

62% (1982)

71% (1981)

73% (1975)

67% (2008)

61% (2000)

55% (1985)

65% (1977)

67% (1977)

58% (2005)

61% (2007)

64% (1997)

61% (1979)

66% (1991)