72% (1971)

50% (1985)

61% (1971)

66% (1972)

38% (1977)

59% (1989)

57% (1981)

57% (1990)

70% (1981)

53% (1987)

50% (1979)

63% (1972)

58% (1971)

63% (1972)

50% (1988)

49% (1985)

50% (1972)

60% (1970)

58% (1987)

41% (1990)