Monthly Passenger-Miles
1920-01-01 75.8000
1920-02-01 74.7000
1920-03-01 77.0000
1920-04-01 80.7000
1920-05-01 81.8000
1920-06-01 90.2000
1920-07-01 98.8000
1920-08-01 103.000
1920-09-01 92.2000
1920-10-01 80.3000
1920-11-01 77.0000
1920-12-01 75.5000
1921-01-01 71.4000
1921-02-01 67.9000
1921-03-01 66.0000
1921-04-01 63.7000
1921-05-01 65.3000
1921-06-01 71.9000
1921-07-01 77.4000
1921-08-01 77.1000
1921-09-01 73.3000
1921-10-01 64.4000
1921-11-01 60.4000
1921-12-01 62.0000
1922-01-01 59.5000
1922-02-01 58.8000
1922-03-01 57.4000
1922-04-01 62.0000
1922-05-01 62.3000
1922-06-01 72.3000
1922-07-01 76.0000
1922-08-01 77.7000
1922-09-01 75.7000
1922-10-01 67.7000
1922-11-01 63.9000
1922-12-01 68.3000
1923-01-01 63.8000
1923-02-01 62.3000
1923-03-01 61.7000
1923-04-01 64.5000
1923-05-01 64.8000
1923-06-01 76.2000
1923-07-01 78.1000
1923-08-01 80.6000
1923-09-01 77.6000
1923-10-01 66.2000
1923-11-01 63.2000
1923-12-01 68.8000
1924-01-01 63.0000
1924-02-01 61.9000
1924-03-01 60.7000
1924-04-01 61.3000
1924-05-01 61.4000
1924-06-01 72.8000
1924-07-01 72.6000
1924-08-01 77.0000
1924-09-01 70.4000
1924-10-01 60.5000
1924-11-01 59.3000
1924-12-01 62.1000
1925-01-01 61.2000
1925-02-01 60.1000
1925-03-01 56.3000
1925-04-01 57.3000
1925-05-01 60.3000
1925-06-01 72.0000
1925-07-01 74.1000
1925-08-01 78.8000
1925-09-01 73.1000
1925-10-01 62.9000
1925-11-01 60.4000
1925-12-01 63.2000
1926-01-01 62.1000
1926-02-01 61.1000
1926-03-01 56.8000
1926-04-01 58.9000
1926-05-01 60.8000
1926-06-01 71.2000
1926-07-01 73.3000
1926-08-01 74.8000
1926-09-01 71.4000
1926-10-01 61.3000
1926-11-01 58.6000
1926-12-01 62.2000
1927-01-01 60.7000
1927-02-01 59.3000
1927-03-01 55.2000
1927-04-01 58.3000
1927-05-01 60.2000
1927-06-01 67.8000
1927-07-01 71.3000
1927-08-01 70.9000
1927-09-01 68.7000
1927-10-01 59.0000
1927-11-01 56.6000
1927-12-01 59.7000
1928-01-01 58.3000
1928-02-01 56.8000
1928-03-01 53.7000
1928-04-01 57.0000
1928-05-01 55.9000
1928-06-01 67.4000
1928-07-01 68.3000
1928-08-01 69.9000
1928-09-01 67.8000
1928-10-01 57.5000
1928-11-01 54.8000
1928-12-01 59.1000
1929-01-01 57.5000
1929-02-01 59.2000
1929-03-01 56.9000
1929-04-01 56.0000
1929-05-01 56.9000
1929-06-01 67.9000
1929-07-01 67.3000
1929-08-01 70.8000
1929-09-01 65.2000
1929-10-01 55.3000
1929-11-01 53.3000
1929-12-01 58.3000