Month Millions Of Dollars 1956-02-01 274.700 1956-03-01 341.900 1956-04-01 369.200 1956-05-01 402.300 1956-06-01 417.300 1956-07-01 348.600 1956-08-01 414.000 1956-09-01 397.200 1956-10-01 430.800 1956-11-01 472.500 1956-12-01 585.200 1957-01-01 299.400 1957-02-01 279.300 1957-03-01 339.800 1957-04-01 394.800 1957-05-01 428.500 1957-06-01 418.500 1957-07-01 388.500 1957-08-01 438.300 1957-09-01 404.300 1957-10-01 436.600 1957-11-01 453.500 1957-12-01 590.800 1958-01-01 296.800 1958-02-01 263.900 1958-03-01 336.200 1958-04-01 396.300 1958-05-01 428.300 1958-06-01 405.400 1958-07-01 396.700 1958-08-01 435.700 1958-09-01 430.400 1958-10-01 473.700 1958-11-01 476.100 1958-12-01 665.400 1959-01-01 330.300