Month	Millions Of Miles
1920-01-01	17.8500
1920-02-01	16.1500
1920-03-01	17.9700
1920-04-01	17.1200
1920-05-01	18.1300
1920-06-01	18.4600
1920-07-01	19.9500
1920-08-01	19.8100
1920-09-01	19.1600
1920-10-01	17.4900
1920-11-01	17.5900
1920-12-01	18.2600
1921-01-01	18.2700
1921-02-01	16.7700
1921-03-01	18.4600
1921-04-01	14.6900
1921-05-01	10.4800
1921-06-01	10.7300
1921-07-01	17.7500
1921-08-01	20.5700
1921-09-01	19.6100
1921-10-01	19.0600
1921-11-01	18.6500
1921-12-01	19.2300
1922-01-01	18.8800
1922-02-01	17.4100
1922-03-01	19.5300
1922-04-01	18.0700
1922-05-01	19.9200
1922-06-01	20.2100
1922-07-01	21.5700
1922-08-01	22.4400
1922-09-01	21.3000
1922-10-01	20.0000
1922-11-01	19.6400
1922-12-01	19.3900
1923-01-01	20.3400
1923-02-01	18.2200
1923-03-01	20.1000
1923-04-01	19.3800
1923-05-01	21.0600
1923-06-01	20.9000
1923-07-01	22.7100
1923-08-01	23.8900
1923-09-01	21.9000
1923-10-01	21.4300
1923-11-01	20.4900
1923-12-01	20.2500
1924-01-01	17.9200
1924-02-01	19.6900
1924-03-01	20.6700
1924-04-01	20.4000
1924-05-01	21.7400
1924-06-01	21.4200
1924-07-01	23.9400
1924-08-01	24.0500
1924-09-01	22.6200
1924-10-01	21.5600
1924-11-01	19.8300
1924-12-01	20.6200
1925-01-01	21.1900
1925-02-01	18.9900
1925-03-01	20.7900
1925-04-01	20.5700
1925-05-01	21.4400
1925-06-01	22.3600
1925-07-01	24.5900
1925-08-01	24.8200
1925-09-01	23.1300
1925-10-01	22.0600
1925-11-01	20.3700
1925-12-01	21.3000
1926-01-01	21.1300
1926-02-01	19.3900
1926-03-01	21.7800
1926-04-01	20.9900
1926-05-01	9.92000
1926-06-01	13.8000
1926-07-01	19.3600
1926-08-01	22.7100
1926-09-01	21.9000
1926-10-01	21.4200
1926-11-01	20.1700
1926-12-01	20.9300
1927-01-01	21.1100
1927-02-01	19.3400
1927-03-01	21.9000
1927-04-01	21.2400
1927-05-01	21.8500
1927-06-01	23.0400
1927-07-01	24.8900
1927-08-01	25.6400
1927-09-01	23.7900
1927-10-01	22.1000
1927-11-01	21.4900
1927-12-01	22.2400
1928-01-01	21.7700
1928-02-01	20.7700
1928-03-01	22.5400
1928-04-01	21.2900
1928-05-01	23.4400
1928-06-01	23.6000
1928-07-01	25.5400
1928-08-01	26.7400
1928-09-01	24.0000
1928-10-01	23.2100
1928-11-01	22.0500
1928-12-01	21.9600
1929-01-01	22.8500
1929-02-01	20.4200
1929-03-01	22.3400
1929-04-01	22.6200
1929-05-01	24.1300
1929-06-01	23.6100
1929-07-01	26.6700
1929-08-01	27.4300
1929-09-01	24.3200
1929-10-01	23.7300
1929-11-01	22.5200
1929-12-01	22.3800
1930-01-01	23.3400
1930-02-01	20.8700
1930-03-01	22.8700
1930-04-01	22.7800
1930-05-01	23.8700
1930-06-01	24.1700
1930-07-01	26.8100
1930-08-01	27.0500
1930-09-01	24.7300
1930-10-01	23.5800
1930-11-01	21.8900
1930-12-01	22.6000
1931-01-01	23.1100
1931-02-01	20.6700
1931-03-01	22.6500
1931-04-01	22.4600
1931-05-01	23.5700
1931-06-01	23.9300
1931-07-01	26.0800
1931-08-01	26.5200
1931-09-01	24.0500
1931-10-01	23.3100
1931-11-01	21.6100
1931-12-01	22.5500