60% (1974)

62% (1977)

53% (1977)

46% (1972)

51% (1985)

44% (1983)

21% (1972)

58% (1979)

57% (1976)

57% (1976)

64% (1977)

52% (1985)

52% (1976)

46% (1987)

41% (1985)

52% (1981)

70% (1977)

46% (1971)

38% (1972)

49% (1988)