Month	Million Square Feet
1919-01-01	1.16000
1919-02-01	0.580000
1919-03-01	1.39000
1919-04-01	1.58000
1919-05-01	2.46000
1919-06-01	4.53000
1919-07-01	4.98000
1919-08-01	4.65000
1919-09-01	3.37000
1919-10-01	3.95000
1919-11-01	2.13000
1919-12-01	2.86000
1920-01-01	2.74000
1920-02-01	1.91000
1920-03-01	4.01000
1920-04-01	4.22000
1920-05-01	4.07000
1920-06-01	4.38000
1920-07-01	3.73000
1920-08-01	3.52000
1920-09-01	2.70000
1920-10-01	2.90000
1920-11-01	1.60000
1920-12-01	1.22000
1921-01-01	2.31000
1921-02-01	1.92000
1921-03-01	3.76000
1921-04-01	4.77000
1921-05-01	5.48000
1921-06-01	5.35000
1921-07-01	6.20000
1921-08-01	5.52000
1921-09-01	6.90000
1921-10-01	4.21000
1921-11-01	3.82000
1921-12-01	4.43000
1922-01-01	2.96000
1922-02-01	3.48000
1922-03-01	6.33000
1922-04-01	8.41000
1922-05-01	7.92000
1922-06-01	9.59000
1922-07-01	8.85000
1922-08-01	7.36000
1922-09-01	4.42000
1922-10-01	4.63000
1922-11-01	3.48000
1922-12-01	3.04000
1923-01-01	2.87000
1923-02-01	4.83000
1923-03-01	5.60000
1923-04-01	6.76000
1923-05-01	4.71000
1923-06-01	5.33000
1923-07-01	5.27000
1923-08-01	4.22000
1923-09-01	3.79000
1923-10-01	5.57000
1923-11-01	4.53000
1923-12-01	4.18000
1924-01-01	3.50000
1924-02-01	6.09000
1924-03-01	6.56000
1924-04-01	6.02000
1924-05-01	7.40000
1924-06-01	5.42000
1924-07-01	7.21000
1924-08-01	5.11000
1924-09-01	5.44000
1924-10-01	4.33000
1924-11-01	3.25000
1924-12-01	3.98000
1925-01-01	2.73000
1925-02-01	4.28000
1925-03-01	6.56000
1925-04-01	6.10000
1925-05-01	5.64000
1925-06-01	9.44000
1925-07-01	7.48000
1925-08-01	6.58000
1925-09-01	7.31000
1925-10-01	4.47000
1925-11-01	3.73000
1925-12-01	4.49000