The CDC has been reporting annually on the number and rate of abortions since 1969. The annual numbers are based on voluntary reports from states and some other municipalities. A few states, such as California, which is the most populous, do not report. That explains why the CDC said there were about 785,000 abortions in 2009, while other estimates put the number at more than 1 million.
To make comparisons possible, the CDC said it used the data from 43 states and two cities that have been reporting the numbers each year for 10 years. Those areas account for 772,630 abortions in 2009, or about 98.5% of the total reported to the federal agency....