Month	Million Square Feet
1919-01-01	13.1000
1919-02-01	15.1000
1919-03-01	25.7000
1919-04-01	39.2000
1919-05-01	51.0000
1919-06-01	65.5000
1919-07-01	65.7000
1919-08-01	62.2000
1919-09-01	50.0000
1919-10-01	68.5000
1919-11-01	51.8000
1919-12-01	49.4000
1920-01-01	41.9000
1920-02-01	34.7000
1920-03-01	54.6000
1920-04-01	51.2000
1920-05-01	42.1000
1920-06-01	36.9000
1920-07-01	28.0000
1920-08-01	28.0000
1920-09-01	26.3000
1920-10-01	25.3000
1920-11-01	19.4000
1920-12-01	13.7000
1921-01-01	15.4000
1921-02-01	16.9000
1921-03-01	26.7000
1921-04-01	34.5000
1921-05-01	35.4000
1921-06-01	35.1000
1921-07-01	31.6000
1921-08-01	35.1000
1921-09-01	41.4000
1921-10-01	40.4000
1921-11-01	37.5000
1921-12-01	34.9000
1922-01-01	30.0000
1922-02-01	29.9000
1922-03-01	51.8000
1922-04-01	57.7000
1922-05-01	59.4000
1922-06-01	60.4000
1922-07-01	51.6000
1922-08-01	52.9000
1922-09-01	43.7000
1922-10-01	46.6000
1922-11-01	46.6000
1922-12-01	39.5000
1923-01-01	38.3000
1923-02-01	41.1000
1923-03-01	64.8000
1923-04-01	65.2000
1923-05-01	60.0000
1923-06-01	45.6000
1923-07-01	41.8000
1923-08-01	39.6000
1923-09-01	38.9000
1923-10-01	53.9000
1923-11-01	51.0000
1923-12-01	47.8000
1924-01-01	48.8000
1924-02-01	47.6000
1924-03-01	67.7000
1924-04-01	62.9000
1924-05-01	57.2000
1924-06-01	47.1000
1924-07-01	39.1000
1924-08-01	41.6000
1924-09-01	43.2000
1924-10-01	47.2000
1924-11-01	48.4000
1924-12-01	46.7000
1925-01-01	41.6000
1925-02-01	37.9000
1925-03-01	64.1000
1925-04-01	72.1000
1925-05-01	68.2000
1925-06-01	66.1000
1925-07-01	67.4000
1925-08-01	77.0000
1925-09-01	67.8000
1925-10-01	67.3000
1925-11-01	66.6000
1925-12-01	63.5000