The demographic situation in developed countries.
D001723:Birth Rate; D003710:Demography; D005060:Europe; D005298:Fertility; D007564:Japan; D011153:Population; D011157:Population Dynamics; D011158:Population Growth; D011640:Public Policy; D014586:USSR; D014481:United States
Birth Rate; Demographic Factors; Europe; Fertility; Fertility Measurements; Fertility Rate--changes; Japan; Policy; Population; Population Dynamics; Population Growth--changes; Population Policy; Social Policy; United States; Ussr