Month	Million Square Feet
1919-01-01	2.49000
1919-02-01	3.93000
1919-03-01	5.56000
1919-04-01	9.11000
1919-05-01	9.32000
1919-06-01	15.7200
1919-07-01	12.1700
1919-08-01	10.7500
1919-09-01	8.92000
1919-10-01	13.9100
1919-11-01	8.54000
1919-12-01	9.48000
1920-01-01	7.32000
1920-02-01	8.67000
1920-03-01	10.1800
1920-04-01	10.8400
1920-05-01	8.40000
1920-06-01	9.50000
1920-07-01	7.33000
1920-08-01	5.00000
1920-09-01	5.87000
1920-10-01	4.93000
1920-11-01	3.61000
1920-12-01	2.34000
1921-01-01	3.26000
1921-02-01	3.28000
1921-03-01	4.38000
1921-04-01	4.80000
1921-05-01	5.59000
1921-06-01	5.41000
1921-07-01	6.06000
1921-08-01	6.94000
1921-09-01	7.16000
1921-10-01	7.99000
1921-11-01	5.16000
1921-12-01	4.58000
1922-01-01	4.81000
1922-02-01	6.26000
1922-03-01	8.95000
1922-04-01	10.4200
1922-05-01	9.84000
1922-06-01	10.2900
1922-07-01	8.78000
1922-08-01	7.79000
1922-09-01	9.07000
1922-10-01	6.87000
1922-11-01	6.43000
1922-12-01	5.71000
1923-01-01	5.87000
1923-02-01	7.03000
1923-03-01	9.89000
1923-04-01	10.4000
1923-05-01	9.78000
1923-06-01	8.39000
1923-07-01	7.09000
1923-08-01	6.25000
1923-09-01	6.97000
1923-10-01	7.58000
1923-11-01	6.92000
1923-12-01	7.43000
1924-01-01	6.65000
1924-02-01	7.96000
1924-03-01	10.0100
1924-04-01	7.95000
1924-05-01	9.24000
1924-06-01	7.83000
1924-07-01	6.28000
1924-08-01	6.85000
1924-09-01	7.23000
1924-10-01	8.55000
1924-11-01	8.96000
1924-12-01	7.21000
1925-01-01	9.67000
1925-02-01	5.38000
1925-03-01	9.86000
1925-04-01	10.1700
1925-05-01	12.1400
1925-06-01	11.7700
1925-07-01	10.7600
1925-08-01	14.3900
1925-09-01	11.2000
1925-10-01	9.51000
1925-11-01	9.63000
1925-12-01	9.57000