61% (1971)

72% (1971)

50% (1985)

67% (1981)

62% (1972)

58% (1981)

59% (1989)

53% (1987)

57% (1990)

50% (1979)

62% (1972)

39% (1977)

50% (1972)

60% (1972)

41% (1990)

52% (1983)

58% (1987)

58% (1971)

44% (1987)

60% (1970)