(2002) Life expectancy is a hypothetical measure. It represents the average number of additional years that a person could expect to live if current mortality trends were to continue for the rest of that person's life. But death rates do not remain fixed over time.
By law, the U.S. government is required to count the number of people living in the United States every 10 years.
(2002) Having dropped from around 5 to just under 3 between 1989 and 1996, Iran's total fertility rate has again plunged — this time to 2. Iran, an Islamic country, has followed a unique and rapid path to replacement-level fertility.
2008) Close to 200 million people are living outside their country of birth. Increasing numbers are refugees fleeing their homeland for another country.