Month	Million Square Feet
1919-01-01	4.77000
1919-02-01	2.84000
1919-03-01	5.37000
1919-04-01	7.01000
1919-05-01	11.2300
1919-06-01	12.4000
1919-07-01	14.8600
1919-08-01	18.1900
1919-09-01	14.1500
1919-10-01	20.3100
1919-11-01	20.9900
1919-12-01	19.4300
1920-01-01	18.7800
1920-02-01	13.7100
1920-03-01	22.7000
1920-04-01	13.4300
1920-05-01	10.9700
1920-06-01	10.4100
1920-07-01	6.67000
1920-08-01	6.72000
1920-09-01	8.21000
1920-10-01	5.00000
1920-11-01	5.23000
1920-12-01	3.56000
1921-01-01	2.27000
1921-02-01	1.78000
1921-03-01	2.33000
1921-04-01	3.46000
1921-05-01	3.42000
1921-06-01	3.40000
1921-07-01	2.57000
1921-08-01	2.19000
1921-09-01	2.62000
1921-10-01	3.94000
1921-11-01	4.16000
1921-12-01	2.54000
1922-01-01	2.79000
1922-02-01	2.24000
1922-03-01	3.97000
1922-04-01	4.75000
1922-05-01	5.82000
1922-06-01	4.16000
1922-07-01	6.71000
1922-08-01	10.1100
1922-09-01	3.96000
1922-10-01	7.04000
1922-11-01	6.16000
1922-12-01	4.12000
1923-01-01	3.80000
1923-02-01	4.62000
1923-03-01	7.36000
1923-04-01	5.82000
1923-05-01	8.42000
1923-06-01	4.01000
1923-07-01	3.69000
1923-08-01	3.14000
1923-09-01	3.95000
1923-10-01	3.68000
1923-11-01	4.60000
1923-12-01	4.57000
1924-01-01	2.65000
1924-02-01	3.71000
1924-03-01	4.12000
1924-04-01	4.18000
1924-05-01	3.54000
1924-06-01	2.77000
1924-07-01	2.32000
1924-08-01	2.58000
1924-09-01	3.17000
1924-10-01	3.33000
1924-11-01	2.93000
1924-12-01	4.07000
1925-01-01	3.69000
1925-02-01	2.41000
1925-03-01	3.99000
1925-04-01	5.47000
1925-05-01	4.69000
1925-06-01	3.14000
1925-07-01	4.17000
1925-08-01	4.21000
1925-09-01	7.61000
1925-10-01	6.06000
1925-11-01	6.49000
1925-12-01	4.42000