Monthly Passenger-Miles
1920-01-01 18.7000
1920-02-01 18.5000
1920-03-01 19.0000
1920-04-01 19.5000
1920-05-01 19.6000
1920-06-01 21.0000
1920-07-01 22.1000
1920-08-01 22.7000
1920-09-01 20.5000
1920-10-01 18.8000
1920-11-01 18.3000
1920-12-01 17.9000
1921-01-01 17.1000
1921-02-01 16.7000
1921-03-01 16.2000
1921-04-01 15.6000
1921-05-01 16.1000
1921-06-01 17.2000
1921-07-01 17.8000
1921-08-01 17.8000
1921-09-01 16.9000
1921-10-01 15.5000
1921-11-01 14.8000
1921-12-01 15.1000
1922-01-01 14.6000
1922-02-01 14.6000
1922-03-01 14.2000
1922-04-01 15.2000
1922-05-01 15.3000
1922-06-01 16.8000
1922-07-01 17.4000
1922-08-01 17.7000
1922-09-01 17.3000
1922-10-01 16.1000
1922-11-01 15.5000
1922-12-01 16.4000
1923-01-01 15.4000
1923-02-01 15.4000
1923-03-01 15.1000
1923-04-01 15.6000
1923-05-01 15.7000
1923-06-01 17.6000
1923-07-01 17.6000
1923-08-01 18.0000
1923-09-01 17.3000
1923-10-01 15.6000
1923-11-01 15.2000
1923-12-01 16.2000
1924-01-01 15.1000
1924-02-01 15.0000
1924-03-01 14.7000
1924-04-01 14.7000
1924-05-01 14.8000
1924-06-01 16.7000
1924-07-01 16.4000
1924-08-01 17.1000
1924-09-01 15.9000
1924-10-01 14.3000
1924-11-01 14.1000
1924-12-01 14.7000
1925-01-01 14.4000
1925-02-01 14.3000
1925-03-01 13.4000
1925-04-01 13.5000
1925-05-01 14.2000
1925-06-01 16.1000
1925-07-01 16.1000
1925-08-01 16.8000
1925-09-01 15.7000
1925-10-01 14.2000
1925-11-01 13.7000
1925-12-01 14.3000
1926-01-01 14.0000
1926-02-01 14.0000
1926-03-01 13.1000
1926-04-01 13.5000
1926-05-01 13.8000
1926-06-01 15.4000
1926-07-01 15.5000
1926-08-01 15.8000
1926-09-01 15.1000
1926-10-01 13.6000
1926-11-01 13.2000
1926-12-01 13.9000
1927-01-01 13.4000
1927-02-01 13.3000
1927-03-01 12.4000
1927-04-01 13.0000
1927-05-01 13.3000
1927-06-01 14.5000
1927-07-01 14.8000
1927-08-01 14.8000
1927-09-01 14.3000
1927-10-01 12.8000
1927-11-01 12.5000
1927-12-01 13.1000
1928-01-01 12.7000
1928-02-01 12.5000
1928-03-01 11.8000
1928-04-01 12.4000
1928-05-01 12.3000
1928-06-01 14.1000
1928-07-01 13.9000
1928-08-01 14.2000
1928-09-01 13.8000
1928-10-01 12.2000
1928-11-01 12.0000
1928-12-01 12.7000
1929-01-01 12.2000
1929-02-01 12.6000
1929-03-01 12.0000
1929-04-01 11.9000
1929-05-01 12.1000
1929-06-01 13.7000
1929-07-01 13.4000
1929-08-01 14.0000
1929-09-01 13.0000
1929-10-01 11.6000
1929-11-01 11.3000
1929-12-01 12.3000
1930-01-01 11.4000
1930-02-01 11.5000
1930-03-01 10.6000
1930-04-01 10.8000
1930-05-01 11.1000
1930-06-01 12.4000
1930-07-01 12.2000
1930-08-01 12.4000
1930-09-01 11.6000
1930-10-01 10.4000
1930-11-01 10.4000
1930-12-01 10.6000
1931-01-01 10.1000
1931-02-01 10.5000
1931-03-01 9.70000
1931-04-01 10.5000
1931-05-01 10.7000
1931-06-01 11.6000
1931-07-01 11.3000
1931-08-01 11.3000
1931-09-01 11.0000
1931-10-01 9.40000
1931-11-01 9.50000
1931-12-01 9.90000
1932-01-01 9.30000
1932-02-01 9.60000
1932-03-01 9.30000
1932-04-01 9.10000
1932-05-01 9.70000
1932-06-01 10.2000
1932-07-01 10.5000
1932-08-01 10.5000
1932-09-01 10.8000
1932-10-01 9.20000
1932-11-01 9.00000
1932-12-01 10.0000
1933-01-01 8.70000
1933-02-01 8.90000
1933-03-01 8.00000
1933-04-01 9.10000
1933-05-01 9.40000
1933-06-01 10.9000
1933-07-01 11.4000
1933-08-01 11.7000
1933-09-01 11.8000
1933-10-01 11.0000
1933-11-01 9.80000
1933-12-01 10.9000
1934-01-01 9.90000
1934-02-01 10.3000
1934-03-01 10.0000
1934-04-01 10.5000
1934-05-01 10.1000
1934-06-01 11.6000
1934-07-01 11.8000
1934-08-01 12.2000
1934-09-01 11.7000
1934-10-01 10.8000
1934-11-01 10.0000
1934-12-01 11.3000
1935-01-01 10.4000
1935-02-01 10.7000
1935-03-01 9.90000
1935-04-01 10.3000
1935-05-01 10.1000
1935-06-01 11.5000
1935-07-01 11.5000
1935-08-01 12.2000
1935-09-01 11.6000
1935-10-01 10.5000
1935-11-01 10.7000
1935-12-01 11.8000