41% (1978)

43% (1982)

69% (1976)

58% (1976)

69% (1975)

55% (1978)

65% (1976)

50% (1978)

47% (1976)

48% (1979)

66% (1979)

51% (1976)

75% (1974)

70% (1978)

52% (1982)

56% (1977)

47% (1975)

57% (1977)

53% (1975)

70% (1981)