72% (1971)

61% (1971)

58% (1981)

50% (1985)

62% (1972)

59% (1989)

53% (1987)

62% (1972)

57% (1990)

67% (1981)

50% (1972)

50% (1979)

52% (1983)

39% (1977)

44% (1987)

60% (1972)

41% (1990)

58% (1987)

58% (1971)

60% (1970)