2. Fig. 6. United Nations total fertility rate data and projections, 1950-2025. The United Nations
provides data and projections for 187 countries from 1950 to 2025. Source of data: United
Nations [24].

3. Fig. 7.Logistic decline of total fertility rate, Finland, 1776-1983. This figure fits a logistic
curve to the decline in total fertility from a stable value in 1776 of 4.95 births per woman to
the current value of 1.55 births per woman. The pulse of fertility in the 1940s and 1950s
(squares) is modeled in Figure 8. Source of data: Lutz [17].

4. Fig. 8.Logistic "pulse" of fertility during a logistic decline, Finland, 1930-1983. This figure
integrates the "pulse" of fertility evident in Figure 7 (the portion of the data plotted with
squares instead of circles). The tbeoretical declining logistic curve was subtracted from this
"bell-shaped" portion of the data, and the integral (cumulative sum) was then plotted and fit
to a logistic curve to show the shape of the "babyboom" process. Source of data: Lutz [17].

5. Fig. 9.Logistic decline of infant mortality, Norway, 1850-1990. The decline from 121 deaths
per 1,000 infants born to 10 infants is dramatic and remarkably regular. The logistic was fit
assuming a final goal of zero deaths, where the theoretical limit might be around 3 to 4,
depending on advances in medical technology and screening procedures. Sources of data:
Flora [46] and United Nations [24].

6. Fig. 10. Logistic declines of infant mortality and total fertility rate, Finland, 1800-1983. The
Fisher-Pry transforms of the fitted logistics are plotted together for comparison. The data are
not shown so as to ease comparison. Source of data: Lutz [17].

7. Fig. 11.Total fertility rate, Sweden, 1900-1993. Sources of data: Conseil de l'Europe [15] and
United Nations [24].
[19].