Month	Millions Of Net Ton-Miles
1920-01-01	888.000
1920-02-01	836.000
1920-03-01	945.000
1920-04-01	834.000
1920-05-01	867.000
1920-06-01	880.000
1920-07-01	888.000
1920-08-01	834.000
1920-09-01	881.000
1920-10-01	801.000
1920-11-01	767.000
1920-12-01	731.000
1921-01-01	664.000
1921-02-01	618.000
1921-03-01	636.000
1921-04-01	531.000
1921-05-01	424.000
1921-06-01	424.000
1921-07-01	481.000
1921-08-01	595.000
1921-09-01	625.000
1921-10-01	623.000
1921-11-01	623.000
1921-12-01	563.000
1922-01-01	545.000
1922-02-01	568.000
1922-03-01	670.000
1922-04-01	537.000
1922-05-01	642.000
1922-06-01	579.000
1922-07-01	601.000
1922-08-01	635.000
1922-09-01	652.000
1922-10-01	682.000
1922-11-01	683.000
1922-12-01	615.000
1923-01-01	703.000
1923-02-01	668.000
1923-03-01	777.000
1923-04-01	722.000
1923-05-01	772.000
1923-06-01	740.000
1923-07-01	702.000
1923-08-01	715.000
1923-09-01	725.000
1923-10-01	801.000
1923-11-01	764.000
1923-12-01	682.000
1924-01-01	654.000
1924-02-01	779.000
1924-03-01	817.000
1924-04-01	764.000
1924-05-01	834.000
1924-06-01	714.000
1924-07-01	788.000
1924-08-01	719.000
1924-09-01	784.000
1924-10-01	834.000
1924-11-01	764.000
1924-12-01	718.000
1925-01-01	762.000
1925-02-01	726.000
1925-03-01	800.000
1925-04-01	736.000
1925-05-01	775.000
1925-06-01	718.000
1925-07-01	771.000
1925-08-01	696.000
1925-09-01	773.000
1925-10-01	806.000
1925-11-01	749.000
1925-12-01	714.000
1926-01-01	722.000
1926-02-01	741.000
1926-03-01	868.000
1926-04-01	762.000
1926-05-01	385.000
1926-06-01	640.000
1926-07-01	598.000
1926-08-01	584.000
1926-09-01	646.000
1926-10-01	673.000
1926-11-01	654.000
1926-12-01	671.000
1927-01-01	733.000
1927-02-01	736.000
1927-03-01	879.000
1927-04-01	783.000
1927-05-01	845.000
1927-06-01	766.000
1927-07-01	763.000
1927-08-01	767.000
1927-09-01	789.000
1927-10-01	814.000
1927-11-01	804.000
1927-12-01	706.000
1928-01-01	705.000
1928-02-01	746.000
1928-03-01	822.000
1928-04-01	707.000
1928-05-01	794.000
1928-06-01	760.000
1928-07-01	743.000
1928-08-01	747.000
1928-09-01	753.000
1928-10-01	824.000
1928-11-01	788.000
1928-12-01	691.000
1929-01-01	746.000
1929-02-01	664.000
1929-03-01	765.000
1929-04-01	820.000
1929-05-01	829.000
1929-06-01	778.000
1929-07-01	819.000
1929-08-01	794.000
1929-09-01	798.000
1929-10-01	888.000
1929-11-01	829.000
1929-12-01	723.000
1930-01-01	794.000
1930-02-01	738.000
1930-03-01	815.000
1930-04-01	751.000
1930-05-01	815.000
1930-06-01	689.000
1930-07-01	751.000
1930-08-01	673.000
1930-09-01	729.000
1930-10-01	810.000
1930-11-01	704.000
1930-12-01	652.000
1931-01-01	669.000
1931-02-01	620.000
1931-03-01	693.000
1931-04-01	671.000
1931-05-01	656.000
1931-06-01	672.000
1931-07-01	693.000
1931-08-01	615.000
1931-09-01	671.000
1931-10-01	731.000
1931-11-01	671.000
1931-12-01	633.000