67% (1979)

63% (1979)

49% (1977)

49% (1976)

43% (1976)

62% (1978)

63% (1972)

50% (1976)

55% (1977)

51% (1976)

67% (1963)

63% (1974)

59% (1973)

65% (1964)

52% (1969)

60% (1976)

66% (1973)

47% (1972)

55% (1965)

63% (1962)