This bilateral graph dated 1991 displays the birth and death rates for Sri Lanka. These two related variables are combined to calculate the natural rate of population increase or decrease. Since the poorer countries of the world are seeing better public health, the death rates are dropping. Although a little behind, the decrease in birth rates may be attributed to better opportunities and education for women. It could also be related to health and lower numbers of infant/child deaths that might contribute to more births. Based on previous studies, most developed countries have experienced this type of trend and the developing ones probably have similar current graphs. These trends are the result of improvements in sanitation, better nutrition and access to medication/health care.Link to website source:
http://users.rcn.com/jkimball.ma.ultranet/BiologyPages/P/Populations.html
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