73% (1975)

73% (1975)

72% (1986)

71% (2006)

64% (1972)

76% (1985)

70% (1977)

55% (2003)

77% (1988)

68% (1998)

58% (1969)

69% (2002)

64% (1957)

72% (1976)

65% (2015)

70% (1976)

64% (1970)

66% (1995)

78% (1995)

67% (1989)