71% (1975)

61% (1984)

71% (1968)

71% (1971)

53% (1973)

67% (1976)

64% (1974)

63% (1979)

64% (1978)

58% (1976)

82% (1974)

58% (1979)

52% (1982)

59% (1981)

46% (1973)

56% (1973)

41% (1974)

80% (1972)

54% (1973)

54% (1973)