(CNN) -- Here's a look at what you need to know about abortion laws and statistics in the U.S.
Facts: January 22, 1973 - Roe v. Wade - The U.S. Supreme Court, in a 7-2 decision, affirms the legality of a woman's right to have an abortion under the Fourteenth Amendment to the Constitution.
The most common method of legal abortion (before thirteen weeks) is surgical vacuum aspiration.
"Partial birth abortion" is a controversial name for intact dilation and evacuation (or extraction). A ban on the procedure was upheld by the Supreme Court in 2007.
Abortion Statistics: The following is the number of abortions reported to the CDC: 2009: 784,507
The number of abortions in the U.S. increased gradually from 1973, then peaked in 1990 and has been on the decline since then.
The abortion ratio increased from 196 per 1,000 live births in 1973 to 358 per 1,000 in 1979 and remained nearly stable through 1981.
The ratio peaked at 364 per 1,000 in 1984 and has steadily declined since then.
2009 Statistics: 2009 is the most recent year for which the CDC has released statistics.
In 2009, 784,507 legally induced abortions were reported to the CDC from 48 areas. (46 states reporting, plus Washington, DC and New York City and New York state but not including California, New Hampshire, Delaware and Maryland)
The abortion ratio in 2009 was 227 out of 1000 live births.
64% of reported legally induced abortions were performed at eight or fewer weeks' gestation period.
Women aged 20-29 years accounted for 57.1% of all abortions in 2009.
Women aged 20-24 years had the highest abortion rates of any age group, 27.4 abortions per 1,000 women.
The state of New York reported the most abortions in 2009 (119,996), followed by Florida (81,918) and Texas (77, 630).
Wyoming had the lowest number, with too few abortions to calculate, followed by South Dakota (769) and North Dakota (1,290).
Approximately 51.2% of women who obtained legal induced abortions were white (including Hispanic and non-Hispanic white women), 41.2% black, and 7.6% other.
85% of women who had abortions were unmarried. (37 areas reporting)