Month	Millions Of Wagon-Miles
1920-01-01	310.000
1920-02-01	291.000
1920-03-01	330.000
1920-04-01	289.000
1920-05-01	302.000
1920-06-01	311.000
1920-07-01	314.000
1920-08-01	293.000
1920-09-01	310.000
1920-10-01	253.000
1920-11-01	271.000
1920-12-01	270.000
1921-01-01	258.000
1921-02-01	238.000
1921-03-01	244.000
1921-04-01	161.000
1921-05-01	134.000
1921-06-01	143.000
1921-07-01	213.000
1921-08-01	247.000
1921-09-01	247.000
1921-10-01	248.000
1921-11-01	251.000
1921-12-01	239.000
1922-01-01	229.000
1922-02-01	238.000
1922-03-01	271.000
1922-04-01	225.000
1922-05-01	255.000
1922-06-01	223.000
1922-07-01	252.000
1922-08-01	267.000
1922-09-01	271.000
1922-10-01	281.000
1922-11-01	281.000
1922-12-01	253.000
1923-01-01	278.000
1923-02-01	261.000
1923-03-01	296.000
1923-04-01	268.000
1923-05-01	284.000
1923-06-01	285.000
1923-07-01	269.000
1923-08-01	274.000
1923-09-01	281.000
1923-10-01	301.000
1923-11-01	291.000
1923-12-01	264.000
1924-01-01	242.000
1924-02-01	295.000
1924-03-01	309.000
1924-04-01	281.000
1924-05-01	302.000
1924-06-01	255.000
1924-07-01	291.000
1924-08-01	272.000
1924-09-01	294.000
1924-10-01	307.000
1924-11-01	281.000
1924-12-01	273.000
1925-01-01	286.000
1925-02-01	270.000
1925-03-01	294.000
1925-04-01	267.000
1925-05-01	279.000
1925-06-01	257.000
1925-07-01	299.000
1925-08-01	255.000
1925-09-01	278.000
1925-10-01	297.000
1925-11-01	275.000
1925-12-01	275.000
1926-01-01	277.000
1926-02-01	274.000
1926-03-01	311.000
1926-04-01	278.000
1926-05-01	108.000
1926-06-01	190.000
1926-07-01	190.000
1926-08-01	188.000
1926-09-01	209.000
1926-10-01	238.000
1926-11-01	249.000
1926-12-01	265.000
1927-01-01	280.000
1927-02-01	271.000
1927-03-01	307.000
1927-04-01	267.000
1927-05-01	287.000
1927-06-01	271.000
1927-07-01	280.000
1927-08-01	278.000
1927-09-01	288.000
1927-10-01	290.000
1927-11-01	283.000
1927-12-01	265.000
1928-01-01	263.000
1928-02-01	262.000
1928-03-01	289.000
1928-04-01	244.000
1928-05-01	266.000
1928-06-01	261.000
1928-07-01	259.000
1928-08-01	266.000
1928-09-01	271.000
1928-10-01	290.000
1928-11-01	277.000
1928-12-01	253.000
1929-01-01	275.000
1929-02-01	254.000
1929-03-01	284.000
1929-04-01	277.000
1929-05-01	278.000
1929-06-01	267.000
1929-07-01	287.000
1929-08-01	281.000
1929-09-01	281.000
1929-10-01	304.000
1929-11-01	292.000
1929-12-01	262.000
1930-01-01	282.000
1930-02-01	263.000
1930-03-01	283.000
1930-04-01	257.000
1930-05-01	279.000
1930-06-01	237.000
1930-07-01	268.000
1930-08-01	252.000
1930-09-01	266.000
1930-10-01	283.000
1930-11-01	260.000
1930-12-01	254.000
1931-01-01	256.000
1931-02-01	235.000
1931-03-01	257.000
1931-04-01	242.000
1931-05-01	238.000
1931-06-01	246.000
1931-07-01	252.000
1931-08-01	233.000
1931-09-01	252.000
1931-10-01	268.000
1931-11-01	245.000
1931-12-01	245.000