67% (1979)

63% (1979)

59% (1973)

56% (1971)

63% (1978)

67% (1973)

63% (1974)

55% (1970)

66% (1964)

58% (1974)

60% (1976)

66% (1963)

58% (1976)

46% (1977)

66% (1960)

52% (1960)

51% (1979)

49% (1977)

63% (1963)

55% (1977)