56% (1973)

50% (1981)

44% (1972)

52% (1973)

42% (1973)

53% (1970)

45% (1974)

42% (1974)

44% (1975)

71% (1977)

50% (1959)

49% (1981)

46% (1972)

45% (1980)

58% (1979)

43% (1973)

57% (1971)

50% (1977)

50% (1970)

59% (1974)