50% (1981)

49% (1981)

46% (1980)

48% (1974)

67% (1982)

51% (1978)

62% (1973)

55% (1977)

34% (1974)

50% (1981)

54% (1977)

54% (1973)

40% (1978)

44% (1970)

43% (1977)

57% (1980)

53% (1985)

48% (1984)

52% (1980)

41% (1974)