72% (1975)

71% (1971)

60% (1984)

67% (1976)

64% (1978)

58% (1976)

71% (1968)

82% (1974)

54% (1973)

59% (1981)

64% (1974)

53% (1973)

64% (1979)

56% (1973)

58% (1979)

46% (1973)

52% (1982)

39% (1971)

54% (1973)

46% (1971)