72% (1993)

67% (1980)

68% (1986)

70% (1976)

72% (1981)

66% (1985)

71% (1982)

65% (1982)

73% (1973)

54% (2008)

51% (2007)

68% (1967)

68% (1977)

73% (1974)

74% (1967)

58% (1996)

65% (1978)

63% (1980)

65% (1967)

70% (1993)