41% (1978)

57% (1976)

43% (1982)

55% (1978)

50% (1978)

69% (1975)

69% (1976)

58% (1975)

66% (1976)

75% (1974)

51% (1983)

66% (1977)

53% (1975)

62% (1978)

47% (1975)

67% (1979)

47% (1976)

71% (1975)

51% (1976)

70% (1981)