76% (1999)

68% (1971)

65% (1970)

68% (1985)

74% (2006)

67% (1962)

65% (1986)

66% (1963)

70% (2009)

46% (1991)

70% (1967)

69% (1964)

74% (2004)

43% (1994)

62% (1977)

64% (1987)

58% (1969)

40% (1974)

35% (1993)

75% (1994)