60% (1984)

71% (1971)

72% (1968)

68% (1976)

71% (1975)

58% (1976)

82% (1974)

53% (1973)

64% (1978)

64% (1974)

63% (1979)

58% (1979)

59% (1981)

56% (1973)

46% (1973)

54% (1973)

54% (1973)

39% (1971)

46% (1971)

52% (1982)