Month	Million Square Feet
1919-01-01	1.34000
1919-02-01	1.71000
1919-03-01	1.89000
1919-04-01	2.75000
1919-05-01	3.60000
1919-06-01	6.12000
1919-07-01	7.04000
1919-08-01	5.71000
1919-09-01	4.52000
1919-10-01	5.38000
1919-11-01	3.03000
1919-12-01	4.21000
1920-01-01	3.53000
1920-02-01	2.47000
1920-03-01	5.18000
1920-04-01	5.42000
1920-05-01	5.13000
1920-06-01	5.56000
1920-07-01	5.04000
1920-08-01	4.64000
1920-09-01	3.50000
1920-10-01	3.75000
1920-11-01	2.27000
1920-12-01	2.06000
1921-01-01	2.92000
1921-02-01	2.69000
1921-03-01	4.99000
1921-04-01	6.57000
1921-05-01	6.86000
1921-06-01	7.54000
1921-07-01	8.54000
1921-08-01	7.44000
1921-09-01	9.76000
1921-10-01	6.14000
1921-11-01	5.24000
1921-12-01	5.56000
1922-01-01	4.16000
1922-02-01	4.79000
1922-03-01	8.22000
1922-04-01	10.6100
1922-05-01	11.7800
1922-06-01	14.2200
1922-07-01	11.6500
1922-08-01	10.1200
1922-09-01	6.83000
1922-10-01	6.66000
1922-11-01	5.22000
1922-12-01	3.65000
1923-01-01	3.96000
1923-02-01	6.50000
1923-03-01	8.01000
1923-04-01	9.59000
1923-05-01	6.96000
1923-06-01	7.67000
1923-07-01	7.22000
1923-08-01	5.88000
1923-09-01	5.16000
1923-10-01	7.43000
1923-11-01	5.83000
1923-12-01	5.19000
1924-01-01	4.71000
1924-02-01	7.79000
1924-03-01	9.37000
1924-04-01	8.44000
1924-05-01	9.73000
1924-06-01	7.77000
1924-07-01	9.47000
1924-08-01	7.22000
1924-09-01	8.05000
1924-10-01	6.32000
1924-11-01	4.51000
1924-12-01	5.01000
1925-01-01	4.20000
1925-02-01	6.29000
1925-03-01	8.83000
1925-04-01	8.99000
1925-05-01	8.51000
1925-06-01	12.5400
1925-07-01	11.1000
1925-08-01	10.7600
1925-09-01	9.67000
1925-10-01	6.47000
1925-11-01	5.42000
1925-12-01	5.78000