The first real general census was Jan 28 1987, before that were poll taxes (head counts). 3/4 of Russian population were peasants (as defined). Birth rate 49.7 in 1840’s (2014 Niger 46). Infant mortality 25-30%; 50% by age 5. Avg life expect at birth mid-late 20s, though if you got to your teens you would prolly live to 50-60.