43% (1982)

57% (1976)

41% (1978)

69% (1976)

69% (1975)

50% (1978)

66% (1976)

75% (1974)

47% (1976)

62% (1978)

67% (1979)

55% (1978)

48% (1979)

57% (1977)

57% (1976)

56% (1977)

63% (1979)

66% (1977)

47% (1975)

50% (1975)