50% (1985)

71% (1971)

62% (1971)

70% (1981)

57% (1990)

51% (1983)

57% (1981)

62% (1972)

63% (1972)

58% (1971)

50% (1972)

39% (1977)

62% (1972)

53% (1987)

50% (1979)

50% (1988)

59% (1989)

49% (1985)

58% (1987)

41% (1990)