73% (1981)

73% (1966)

80% (1976)

71% (1967)

81% (1979)

78% (1956)

69% (1985)

57% (1984)

79% (1971)

63% (1974)

64% (1982)

63% (1972)

61% (1988)

52% (1987)

59% (1996)

54% (1981)

72% (1980)

67% (1968)

60% (1967)

51% (1956)