Which pre-war life? When did this pre-war life start? Was it the life of the Russian Empire? The Belarusian People’s Republic? Did the pre-war life include the Polish-Soviet War of 1919-1921? Do those wide steady steps at the bottom include Stalin’s Great Purge?
When did the pre-war life end? I think the assumption is it ended with the Nazi invasion in June of 1941, but does this mean the wide steps of the pre-war period include the repression in Belarus that followed Stalin’s invasion and annexation of Poland?