Month	Millions Of Passenger Car-Miles
1920-01-01	187.200
1920-02-01	171.600
1920-03-01	185.900
1920-04-01	182.200
1920-05-01	192.300
1920-06-01	198.000
1920-07-01	217.200
1920-08-01	220.400
1920-09-01	210.500
1920-10-01	200.800
1920-11-01	192.700
1920-12-01	203.900
1921-01-01	197.600
1921-02-01	171.900
1921-03-01	189.500
1921-04-01	182.500
1921-05-01	185.300
1921-06-01	187.700
1921-07-01	204.300
1921-08-01	203.500
1921-09-01	194.900
1921-10-01	187.800
1921-11-01	179.500
1921-12-01	188.400
1922-01-01	185.500
1922-02-01	164.200
1922-03-01	182.700
1922-04-01	177.800
1922-05-01	184.400
1922-06-01	194.600
1922-07-01	200.900
1922-08-01	195.800
1922-09-01	186.800
1922-10-01	183.700
1922-11-01	178.100
1922-12-01	189.900
1923-01-01	190.600
1923-02-01	166.700
1923-03-01	187.400
1923-04-01	182.800
1923-05-01	191.100
1923-06-01	199.300
1923-07-01	213.100
1923-08-01	215.800
1923-09-01	205.300
1923-10-01	197.400
1923-11-01	186.400
1923-12-01	198.800
1924-01-01	196.400
1924-02-01	180.300
1924-03-01	191.600
1924-04-01	189.000
1924-05-01	193.700
1924-06-01	198.700
1924-07-01	211.600
1924-08-01	214.700
1924-09-01	202.000
1924-10-01	193.900
1924-11-01	185.400
1924-12-01	199.500
1925-01-01	200.700
1925-02-01	178.200
1925-03-01	195.500
1925-04-01	192.300
1925-05-01	197.000
1925-06-01	203.900
1925-07-01	220.100
1925-08-01	223.700
1925-09-01	212.400
1925-10-01	204.800
1925-11-01	197.000
1925-12-01	208.700
1926-01-01	207.900
1926-02-01	184.200
1926-03-01	201.800
1926-04-01	197.200
1926-05-01	204.100
1926-06-01	211.200
1926-07-01	226.000
1926-08-01	224.100
1926-09-01	215.200
1926-10-01	205.600
1926-11-01	197.200
1926-12-01	211.700
1927-01-01	211.500
1927-02-01	185.800
1927-03-01	205.200
1927-04-01	198.700
1927-05-01	204.700
1927-06-01	208.600
1927-07-01	226.100
1927-08-01	224.800
1927-09-01	214.400
1927-10-01	203.900
1927-11-01	193.300
1927-12-01	206.900
1928-01-01	207.200
1928-02-01	189.500
1928-03-01	201.900
1928-04-01	195.500
1928-05-01	200.800
1928-06-01	207.900
1928-07-01	221.700
1928-08-01	221.000
1928-09-01	209.200
1928-10-01	202.000
1928-11-01	188.100
1928-12-01	203.000
1929-01-01	207.000
1929-02-01	185.200
1929-03-01	205.000
1929-04-01	196.200
1929-05-01	202.600
1929-06-01	211.200
1929-07-01	224.900
1929-08-01	226.900
1929-09-01	212.300
1929-10-01	203.900
1929-11-01	194.500
1929-12-01	208.600
1930-01-01	211.700
1930-02-01	187.200
1930-03-01	205.200
1930-04-01	196.300
1930-05-01	197.900
1930-06-01	202.600
1930-07-01	210.500
1930-08-01	212.400
1930-09-01	193.800
1930-10-01	188.400
1930-11-01	175.800
1930-12-01	190.000
1931-01-01	189.600
1931-02-01	166.500
1931-03-01	181.300
1931-04-01	174.400
1931-05-01	174.700
1931-06-01	175.300
1931-07-01	187.200
1931-08-01	183.700
1931-09-01	172.700
1931-10-01	163.900
1931-11-01	154.500
1931-12-01	165.800
1932-01-01	161.800
1932-02-01	145.900
1932-03-01	151.200
1932-04-01	143.800
1932-05-01	146.900
1932-06-01	143.400
1932-07-01	152.200
1932-08-01	148.200
1932-09-01	141.600
1932-10-01	133.800
1932-11-01	128.400
1932-12-01	138.100
1933-01-01	134.500
1933-02-01	117.600
1933-03-01	125.000
1933-04-01	119.700
1933-05-01	124.800
1933-06-01	137.400
1933-07-01	143.200
1933-08-01	146.800
1933-09-01	145.800
1933-10-01	144.000
1933-11-01	124.800
1933-12-01	136.800
1934-01-01	135.900
1934-02-01	119.800
1934-03-01	134.200
1934-04-01	131.000
1934-05-01	132.700
1934-06-01	139.000
1934-07-01	150.800
1934-08-01	152.000
1934-09-01	145.000
1934-10-01	142.900
1934-11-01	127.900
1934-12-01	144.700
1935-01-01	144.000
1935-02-01	125.600
1935-03-01	138.800
1935-04-01	134.900
1935-05-01	136.700
1935-06-01	138.600
1935-07-01	148.600
1935-08-01	151.900
1935-09-01	143.200
1935-10-01	140.500
1935-11-01	134.700
1935-12-01	151.300