71% (1975)

71% (1968)

70% (1971)

60% (1984)

67% (1976)

64% (1978)

58% (1976)

53% (1973)

82% (1974)

64% (1974)

59% (1981)

56% (1973)

39% (1971)

62% (1979)

54% (1973)

48% (1982)

46% (1973)

58% (1979)

54% (1973)

46% (1971)