50% (1981)

55% (1973)

72% (1977)

53% (1970)

44% (1972)

57% (1971)

45% (1980)

52% (1973)

44% (1975)

50% (1977)

46% (1972)

34% (1960)

42% (1973)

58% (1979)

45% (1974)

50% (1959)

49% (1981)

51% (1968)

46% (1978)

42% (1974)