2. The entry of small in numbers generations into the reproductive age, the expropriation of 1928-1932 years, the starvation of 1933 year.

3. The prohibition of abortions in 1936 year and steps to the stimulation of birth rate.

4. The decreasing of birth rate during the period of the war of 1941-1945 years.

5. «Baby-boom» after the Second World War .

6. The decreasing of birth rate lower the level of generation’s substitution (less than 2 births per 1 woman).

7. The effect of new family policy of 1983 year and anti-alcohol company of M.Gorbachev.