57% (1976)

43% (1982)

69% (1975)

41% (1978)

69% (1976)

53% (1975)

66% (1976)

51% (1976)

48% (1979)

60% (1981)

52% (1982)

42% (1978)

70% (1981)

67% (1979)

50% (1976)

55% (1978)

60% (1976)

49% (1975)

71% (1975)

50% (1978)