50% (1985)

62% (1971)

62% (1972)

58% (1981)

59% (1989)

72% (1971)

39% (1977)

57% (1990)

62% (1972)

49% (1985)

50% (1979)

63% (1972)

51% (1983)

70% (1981)

53% (1987)

58% (1987)

58% (1971)

50% (1972)

52% (1987)

41% (1990)