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. (0 h 58 m, 1 ene 1921 año – 15 h 14 m, 31 dic 1921 año)
