The study found that the number of illegal immigrants living in the U.S. has stayed the same in the last year.
In 2009, the first time in two decades, the number of illegal immigrants entering the country actually dropped. Experts believe the economy and an increase in security at borders made it less desirable for people to come to the U.S. illegally.
California has the second highest percentage of illegal immigrants in the country. Nevada has the highest.
