69% (1975)

43% (1982)

41% (1978)

58% (1976)

53% (1975)

55% (1978)

69% (1976)

61% (1974)

51% (1978)

64% (1976)

70% (1978)

58% (1975)

71% (1975)

47% (1976)

59% (1978)

66% (1979)

48% (1979)

52% (1982)

61% (1981)

49% (1975)