Month	Million Square Feet
1919-01-01	4.50000
1919-02-01	6.60000
1919-03-01	12.6000
1919-04-01	20.2000
1919-05-01	26.5000
1919-06-01	30.5000
1919-07-01	30.3000
1919-08-01	26.7000
1919-09-01	22.0000
1919-10-01	27.9000
1919-11-01	18.2000
1919-12-01	15.8000
1920-01-01	11.6000
1920-02-01	9.50000
1920-03-01	16.0000
1920-04-01	20.9000
1920-05-01	17.1000
1920-06-01	10.9000
1920-07-01	8.60000
1920-08-01	10.8000
1920-09-01	8.20000
1920-10-01	11.2000
1920-11-01	7.90000
1920-12-01	5.50000
1921-01-01	6.70000
1921-02-01	8.60000
1921-03-01	14.4000
1921-04-01	18.0000
1921-05-01	18.8000
1921-06-01	18.2000
1921-07-01	14.0000
1921-08-01	18.0000
1921-09-01	21.5000
1921-10-01	22.0000
1921-11-01	22.7000
1921-12-01	21.9000
1922-01-01	18.1000
1922-02-01	16.5000
1922-03-01	30.4000
1922-04-01	31.6000
1922-05-01	31.5000
1922-06-01	31.5000
1922-07-01	24.4000
1922-08-01	23.7000
1922-09-01	23.3000
1922-10-01	25.8000
1922-11-01	28.7000
1922-12-01	26.0000
1923-01-01	24.6000
1923-02-01	22.7000
1923-03-01	39.5000
1923-04-01	39.2000
1923-05-01	34.3000
1923-06-01	25.3000
1923-07-01	23.7000
1923-08-01	24.1000
1923-09-01	22.5000
1923-10-01	35.0000
1923-11-01	33.1000
1923-12-01	30.5000
1924-01-01	34.6000
1924-02-01	28.0000
1924-03-01	44.1000
1924-04-01	42.2000
1924-05-01	34.4000
1924-06-01	28.3000
1924-07-01	20.9000
1924-08-01	24.6000
1924-09-01	24.3000
1924-10-01	28.4000
1924-11-01	31.4000
1924-12-01	29.7000
1925-01-01	23.5000
1925-02-01	23.7000
1925-03-01	40.3000
1925-04-01	46.2000
1925-05-01	42.2000
1925-06-01	37.5000
1925-07-01	40.5000
1925-08-01	46.3000
1925-09-01	38.2000
1925-10-01	44.0000
1925-11-01	44.6000
1925-12-01	43.2000
1926-01-01	33.6000
1926-02-01	26.5000
1926-03-01	42.6000
1926-04-01	45.7000
1926-05-01	43.9000
1926-06-01	40.2000
1926-07-01	31.7000
1926-08-01	37.2000
1926-09-01	36.7000
1926-10-01	38.8000
1926-11-01	39.0000
1926-12-01	34.4000