Month	Million Square Feet
1919-01-01	8.60000
1919-02-01	8.50000
1919-03-01	13.1000
1919-04-01	19.0000
1919-05-01	24.5000
1919-06-01	35.0000
1919-07-01	35.4000
1919-08-01	35.5000
1919-09-01	28.0000
1919-10-01	40.6000
1919-11-01	33.6000
1919-12-01	33.6000
1920-01-01	30.3000
1920-02-01	25.2000
1920-03-01	38.6000
1920-04-01	30.3000
1920-05-01	25.0000
1920-06-01	26.0000
1920-07-01	19.4000
1920-08-01	17.2000
1920-09-01	18.1000
1920-10-01	14.1000
1920-11-01	11.5000
1920-12-01	8.20000
1921-01-01	8.70000
1921-02-01	8.30000
1921-03-01	12.3000
1921-04-01	16.5000
1921-05-01	16.6000
1921-06-01	16.9000
1921-07-01	17.6000
1921-08-01	17.1000
1921-09-01	19.9000
1921-10-01	18.4000
1921-11-01	14.8000
1921-12-01	13.0000
1922-01-01	11.9000
1922-02-01	13.4000
1922-03-01	21.4000
1922-04-01	26.1000
1922-05-01	27.9000
1922-06-01	28.9000
1922-07-01	27.2000
1922-08-01	29.2000
1922-09-01	20.4000
1922-10-01	20.8000
1922-11-01	17.9000
1922-12-01	13.5000
1923-01-01	13.7000
1923-02-01	18.4000
1923-03-01	25.3000
1923-04-01	26.0000
1923-05-01	25.7000
1923-06-01	20.4000
1923-07-01	18.1000
1923-08-01	15.5000
1923-09-01	16.4000
1923-10-01	18.9000
1923-11-01	17.9000
1923-12-01	17.3000
1924-01-01	14.2000
1924-02-01	19.6000
1924-03-01	23.7000
1924-04-01	20.7000
1924-05-01	22.8000
1924-06-01	18.8000
1924-07-01	18.2000
1924-08-01	17.0000
1924-09-01	18.9000
1924-10-01	18.8000
1924-11-01	17.0000
1924-12-01	17.0000
1925-01-01	18.1000
1925-02-01	14.2000
1925-03-01	23.8000
1925-04-01	25.9000
1925-05-01	26.0000
1925-06-01	28.6000
1925-07-01	27.0000
1925-08-01	30.7000
1925-09-01	29.6000
1925-10-01	23.3000
1925-11-01	22.0000
1925-12-01	20.3000