Monthly Millions Of Books
1919-01-01 5.60000
1919-02-01 6.33000
1919-03-01 7.92000
1919-04-01 7.14000
1919-05-01 9.17000
1919-06-01 9.75000
1919-07-01 10.9800
1919-08-01 12.9300
1919-09-01 13.7900
1919-10-01 13.3000
1919-11-01 11.1700
1919-12-01 12.4700
1920-01-01 13.6000
1920-02-01 10.9900
1920-03-01 12.3400
1920-04-01 13.3000
1920-05-01 11.2800
1920-06-01 10.8100
1920-07-01 9.15000
1920-08-01 8.32000
1920-09-01 9.38000
1920-10-01 7.58000
1920-11-01 4.63000
1920-12-01 3.72000
1921-01-01 5.42000
1921-02-01 4.54000
1921-03-01 5.36000
1921-04-01 8.30000
1921-05-01 6.98000
1921-06-01 7.68000
1921-07-01 7.92000
1921-08-01 9.19000
1921-09-01 8.52000
1921-10-01 10.6000
1921-11-01 9.38000
1921-12-01 8.08000
1922-01-01 10.1600
1922-02-01 8.80000
1922-03-01 9.65000
1922-04-01 10.3200
1922-05-01 10.2300
1922-06-01 11.0900
1922-07-01 10.5400
1922-08-01 12.0900
1922-09-01 12.2400
1922-10-01 13.4000
1922-11-01 11.1200
1922-12-01 9.71000
1923-01-01 12.2900
1923-02-01 11.4400
1923-03-01 11.5300
1923-04-01 11.1600
1923-05-01 12.3500
1923-06-01 11.4900
1923-07-01 11.3000
1923-08-01 10.9000
1923-09-01 11.3700
1923-10-01 12.1800
1923-11-01 11.2600
1923-12-01 8.85000
1924-01-01 11.4100
1924-02-01 10.9500
1924-03-01 11.7300
1924-04-01 10.4700
1924-05-01 11.0200
1924-06-01 11.0000
1924-07-01 9.77000
1924-08-01 11.6500
1924-09-01 11.8300
1924-10-01 12.2700
1924-11-01 10.5700
1924-12-01 9.19000
1925-01-01 12.0300
1925-02-01 11.4900
1925-03-01 12.4800
1925-04-01 11.3400
1925-05-01 12.2300
1925-06-01 12.3600
1925-07-01 11.7700
1925-08-01 12.1500
1925-09-01 12.5600
1925-10-01 13.5000
1925-11-01 11.6900
1925-12-01 10.3000
1926-01-01 11.7900
1926-02-01 10.5600
1926-03-01 13.2800
1926-04-01 11.4700
1926-05-01 12.2500
1926-06-01 12.9500
1926-07-01 11.6400
1926-08-01 13.2900
1926-09-01 12.6800
1926-10-01 11.7200
1926-11-01 11.0900
1926-12-01 10.2400
1927-01-01 12.9200
1927-02-01 11.6300
1927-03-01 12.0800
1927-04-01 11.0400
1927-05-01 12.2300
1927-06-01 11.7900
1927-07-01 12.2300
1927-08-01 12.7400
1927-09-01 12.2800
1927-10-01 13.8500
1927-11-01 12.1300
1927-12-01 10.6700
1928-01-01 12.3300
1928-02-01 12.3300
1928-03-01 13.1900
1928-04-01 11.8000
1928-05-01 12.1600
1928-06-01 12.7100
1928-07-01 12.1000
1928-08-01 12.5400
1928-09-01 11.8400
1928-10-01 13.9600
1928-11-01 12.7300
1928-12-01 11.1200
1929-01-01 12.8600
1929-02-01 11.7600
1929-03-01 12.3200
1929-04-01 12.7200
1929-05-01 12.7500
1929-06-01 12.3300
1929-07-01 13.7400
1929-08-01 12.8400
1929-09-01 12.9800
1929-10-01 13.8300
1929-11-01 12.1100
1929-12-01 9.83000
1930-01-01 13.0300
1930-02-01 11.6800
1930-03-01 12.3500
1930-04-01 11.6600
1930-05-01 11.7300
1930-06-01 12.6900
1930-07-01 10.9000
1930-08-01 11.0300
1930-09-01 11.6500
1930-10-01 12.2200
1930-11-01 11.0500
1930-12-01 9.46000
1931-01-01 10.7400
1931-02-01 10.0500
1931-03-01 11.2000
1931-04-01 10.2800
1931-05-01 11.5900
1931-06-01 10.5100
1931-07-01 10.3200
1931-08-01 10.5100
1931-09-01 10.2800
1931-10-01 10.6600
1931-11-01 9.97000
1931-12-01 8.10000
1932-01-01 9.26000
1932-02-01 8.65000
1932-03-01 8.91000
1932-04-01 9.43000
1932-05-01 8.49000
1932-06-01 8.91000
1932-07-01 8.40000
1932-08-01 7.88000
1932-09-01 8.58000
1932-10-01 10.1900
1932-11-01 8.48000
1932-12-01 7.65000
1933-01-01 9.74000
1933-02-01 7.91000
1933-03-01 7.40000
1933-04-01 9.90000
1933-05-01 10.3800
1933-06-01 12.9300
1933-07-01 13.0800
1933-08-01 13.3600
1933-09-01 10.9600
1933-10-01 9.70000
1933-11-01 9.34000
1933-12-01 11.2000
1934-01-01 9.43000
1934-02-01 9.73000
1934-03-01 12.1400
1934-04-01 9.78000
1934-05-01 11.6500
1934-06-01 11.1300
1934-07-01 11.4200
1934-08-01 11.1300
1934-09-01 11.8000
1934-10-01 14.6000
1934-11-01 11.5600
1934-12-01 11.2300
1935-01-01 11.1300
1935-02-01 11.6900
1935-03-01 12.4600
1935-04-01 11.3400
1935-05-01 11.7300
1935-06-01 12.2200
1935-07-01 12.7300
1935-08-01 12.3000
1935-09-01 12.3900
1935-10-01 14.9600
1935-11-01 13.3100
1935-12-01 13.0400