72% (1993)

67% (1980)

72% (1981)

68% (1986)

66% (1985)

70% (1976)

65% (1982)

73% (1973)

71% (1982)

68% (1967)

54% (2008)

73% (1974)

62% (1995)

74% (1967)

68% (1977)

51% (2007)

58% (1996)

70% (1993)

65% (1967)

62% (1980)