Crude birth rate- number of births per 1000 people
crude death rate- number of deaths per 1000 people
Rate of natural increase (RNI)- death rate minus birth rate
Net migration rate- The difference between the number of persons entering and leaving a country during a year
An excess of persons entering the country is net migration
It's written in a positive number
Canada has 5.65 migrants per 1000 people
US: 3.62
An excess of people leaving the country is net migration
It's written in a negitive number
Mexico has -3.11 migrants per 1000 people
In 2007, the US had (78.49 total:     76.05 men,  81.05 women) life