71% (1975)

53% (1975)

52% (1982)

66% (1977)

50% (1976)

60% (1983)

51% (1983)

52% (1976)

65% (1979)

66% (1979)

50% (1978)

49% (1975)

57% (1976)

47% (1975)

59% (1978)

45% (1977)

68% (1975)

56% (1975)

58% (1975)

58% (1975)