45% (1972)

56% (1973)

71% (1977)

46% (1972)

45% (1975)

50% (1981)

50% (1981)

55% (1973)

57% (1969)

48% (1980)

34% (1960)

58% (1971)

54% (1970)

42% (1973)

52% (1977)

58% (1979)

55% (1969)

43% (1974)

49% (1978)

46% (1974)