57% (1976)

41% (1978)

70% (1975)

43% (1982)

69% (1976)

50% (1978)

50% (1976)

66% (1976)

48% (1979)

60% (1976)

66% (1979)

42% (1978)

52% (1982)

70% (1981)

66% (1977)

55% (1978)

71% (1975)

75% (1974)

62% (1978)

60% (1981)