Age-specific fertility rates

The Age Specific Fertility Rate (ASFR) is the number of live births per 1,000 women of a specific age in a specified period. For example, the age-specific fertility rate for 25-29 year old women in 2010 is calculated by dividing the number of births in 2010 to women aged 25-29 by the estimated population of women of that age in that year.