evidence: This projected growth of population, like all others, depends on assumptions about vital rates. For example, the chart below shows that the UN Population Division assumes that Total fertility rate (TFR), which has been steadily declining since 1963, will continue to decline, at varying paces depending on circumstances in individual regions, to a below-replacement level of 1.8 by 2100. Between now (2020) and 2100, regions with TFR currently below this rate, for example Europe, will see TFR rise. Regions with TFR above this rate will see TFR continue to decline.[26][25]