53% (1978)

58% (1984)

56% (1970)

100% (1954)

49% (1968)

42% (1988)

43% (1975)

55% (1960)

50% (1979)

62% (1958)

47% (1974)

20% (1973)

35% (1961)

60% (1951)

35% (1972)

53% (1976)

60% (1956)

50% (1955)

65% (1968)

58% (1970)