Month	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