58% (1976)

69% (1976)

44% (1982)

51% (1978)

40% (1978)

70% (1978)

68% (1975)

55% (1978)

48% (1979)

64% (1976)

71% (1975)

66% (1979)

42% (1978)

47% (1976)

60% (1981)

43% (1977)

58% (1978)

70% (1981)

50% (1976)

31% (1976)