Month	Millions Of Wagon-Miles
1920-01-01	434.000
1920-02-01	410.000
1920-03-01	466.000
1920-04-01	408.000
1920-05-01	429.000
1920-06-01	443.000
1920-07-01	452.000
1920-08-01	419.000
1920-09-01	441.000
1920-10-01	346.000
1920-11-01	386.000
1920-12-01	396.000
1921-01-01	382.000
1921-02-01	349.000
1921-03-01	356.000
1921-04-01	206.000
1921-05-01	168.000
1921-06-01	184.000
1921-07-01	311.000
1921-08-01	373.000
1921-09-01	360.000
1921-10-01	364.000
1921-11-01	371.000
1921-12-01	359.000
1922-01-01	347.000
1922-02-01	356.000
1922-03-01	408.000
1922-04-01	338.000
1922-05-01	381.000
1922-06-01	327.000
1922-07-01	374.000
1922-08-01	400.000
1922-09-01	404.000
1922-10-01	418.000
1922-11-01	419.000
1922-12-01	383.000
1923-01-01	419.000
1923-02-01	391.000
1923-03-01	439.000
1923-04-01	402.000
1923-05-01	425.000
1923-06-01	425.000
1923-07-01	403.000
1923-08-01	409.000
1923-09-01	419.000
1923-10-01	459.000
1923-11-01	434.000
1923-12-01	399.000
1924-01-01	359.000
1924-02-01	439.000
1924-03-01	466.000
1924-04-01	425.000
1924-05-01	451.000
1924-06-01	376.000
1924-07-01	431.000
1924-08-01	405.000
1924-09-01	435.000
1924-10-01	452.000
1924-11-01	415.000
1924-12-01	408.000
1925-01-01	427.000
1925-02-01	404.000
1925-03-01	439.000
1925-04-01	398.000
1925-05-01	413.000
1925-06-01	378.000
1925-07-01	443.000
1925-08-01	383.000
1925-09-01	409.000
1925-10-01	438.000
1925-11-01	403.000
1925-12-01	411.000
1926-01-01	416.000
1926-02-01	410.000
1926-03-01	462.000
1926-04-01	412.000
1926-05-01	139.000
1926-06-01	248.000
1926-07-01	255.000
1926-08-01	258.000
1926-09-01	284.000
1926-10-01	330.000
1926-11-01	355.000
1926-12-01	391.000
1927-01-01	421.000
1927-02-01	405.000
1927-03-01	456.000
1927-04-01	396.000
1927-05-01	424.000
1927-06-01	399.000
1927-07-01	414.000
1927-08-01	414.000
1927-09-01	423.000
1927-10-01	425.000
1927-11-01	416.000
1927-12-01	394.000
1928-01-01	396.000
1928-02-01	392.000
1928-03-01	427.000
1928-04-01	364.000
1928-05-01	394.000
1928-06-01	383.000
1928-07-01	384.000
1928-08-01	394.000
1928-09-01	401.000
1928-10-01	431.000
1928-11-01	408.000
1928-12-01	377.000
1929-01-01	413.000
1929-02-01	384.000
1929-03-01	424.000
1929-04-01	417.000
1929-05-01	414.000
1929-06-01	394.000
1929-07-01	425.000
1929-08-01	418.000
1929-09-01	415.000
1929-10-01	447.000
1929-11-01	427.000
1929-12-01	392.000
1930-01-01	424.000
1930-02-01	394.000
1930-03-01	425.000
1930-04-01	384.000
1930-05-01	416.000
1930-06-01	350.000
1930-07-01	398.000
1930-08-01	378.000
1930-09-01	399.000
1930-10-01	421.000
1930-11-01	385.000
1930-12-01	385.000
1931-01-01	389.000
1931-02-01	359.000
1931-03-01	385.000
1931-04-01	364.000
1931-05-01	360.000
1931-06-01	368.000
1931-07-01	379.000
1931-08-01	351.000
1931-09-01	381.000
1931-10-01	401.000
1931-11-01	364.000
1931-12-01	367.000