Monthly 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