Month	Millions Of Net Ton-Miles
1931-01-01	671.000
1931-02-01	620.000
1931-03-01	701.000
1931-04-01	663.000
1931-05-01	699.000
1931-06-01	643.000
1931-07-01	656.000
1931-08-01	650.000
1931-09-01	669.000
1931-10-01	712.000
1931-11-01	684.000
1931-12-01	616.000
1932-01-01	627.000
1932-02-01	608.000
1932-03-01	628.000
1932-04-01	598.000
1932-05-01	607.000
1932-06-01	585.000
1932-07-01	562.000
1932-08-01	557.000
1932-09-01	567.000
1932-10-01	616.000
1932-11-01	609.000
1932-12-01	458.000
1933-01-01	550.000
1933-02-01	533.000
1933-03-01	628.000
1933-04-01	591.000
1933-05-01	634.000
1933-06-01	592.000
1933-07-01	609.000
1933-08-01	625.000
1933-09-01	648.000
1933-10-01	709.000
1933-11-01	704.000
1933-12-01	640.000
1934-01-01	671.000
1934-02-01	642.000
1934-03-01	714.000
1934-04-01	672.000
1934-05-01	707.000
1934-06-01	665.000
1934-07-01	666.000
1934-08-01	677.000
1934-09-01	696.000
1934-10-01	752.000
1934-11-01	722.000
1934-12-01	648.000
1935-01-01	683.000
1935-02-01	637.000
1935-03-01	717.000
1935-04-01	677.000
1935-05-01	692.000
1935-06-01	683.000
1935-07-01	677.000
1935-08-01	684.000
1935-09-01	700.000
1935-10-01	774.000
1935-11-01	754.000
1935-12-01	681.000
1936-01-01	698.000
1936-02-01	699.000
1936-03-01	778.000
1936-04-01	741.000
1936-05-01	778.000
1936-06-01	737.000
1936-07-01	728.000
1936-08-01	748.000
1936-09-01	760.000
1936-10-01	828.000
1936-11-01	782.000
1936-12-01	759.000
1937-01-01	744.000
1937-02-01	707.000
1937-03-01	807.000
1937-04-01	784.000
1937-05-01	815.000
1937-06-01	799.000
1937-07-01	780.000
1937-08-01	799.000
1937-09-01	822.000
1937-10-01	861.000
1937-11-01	814.000
1937-12-01	774.000
1938-01-01	762.000
1938-02-01	726.000
1938-03-01	802.000
1938-04-01	732.000
1938-05-01	714.000
1938-06-01	669.000
1938-07-01	632.000
1938-08-01	648.000
1938-09-01	671.000
1938-10-01	730.000
1938-11-01	683.000
1938-12-01	664.000
1939-01-01	646.000
1939-02-01	663.000
1939-03-01	773.000
1939-04-01	752.000