50% (1985)

62% (1971)

62% (1972)

57% (1990)

58% (1987)

57% (1981)

49% (1985)

41% (1990)

72% (1971)

38% (1977)

51% (1983)

50% (1979)

53% (1987)

52% (1987)

59% (1989)

63% (1972)

62% (1972)

50% (1988)

58% (1971)

50% (1972)