67% (1979)

49% (1977)

50% (1976)

63% (1979)

55% (1977)

59% (1973)

65% (1964)

62% (1974)

52% (1969)

62% (1978)

66% (1973)

59% (1976)

71% (1964)

66% (1973)

60% (1979)

56% (1963)

43% (1976)

46% (1962)

63% (1972)

59% (1961)