By the beginning of 1921, money has lost 96% of its pre-war value; industrial production has fallen to 10% of its 1913 level. The population of Petrograd has fallen from 2.5 million in 1917 to 600,000 in 1920 (6 h 27 min, 26 janv. 1921 ans – 8 h 1 min, 1 déc. 1921 ans)
