While a recent report from the Guttmacher Institute suggests that the national abortion rate is decreasing, it's impossible to say. In the United States, the abortion data and reporting system relies completely on voluntary reporting. Currently, there are only two national organizations collecting abortion data in the United States: The Centers for Disease Control and Prevention, a federal government agency, and the private abortion advocacy group, the Alan Guttmacher Institute. Yet given the charged debate going on today over abortion policy the data matters.