Notes and facts 9/19/14

Today we talked about measuring population, crude death/birth rate, rate of natural increase (RNI), and net migration rate. The crude birth rate is the number of births per 1000 of the population and the crude death rate is the number of deaths. The rate of natural increase (RNI) is produced by subtracting the death rate from the birth rate. This gives us the annual natural growth rate (in percentage form) for a country or region. The net migration rate is the difference between the number of people entering/leaving a country during a year. An excess of people entering the country is net immigration. Net immigration is written as a positive number. People leaving the country is net emigration. This is written as a negative number. The United States used to be #50 in the world for highest life expectancy but now we moved up to #42 in the world. Also, the U.S. is 18th in the world for obesity as of 2008.