Georgia only state to add undocumented immigrants in 2008?

From the AJC:

In 2008, as the economy tanked and illegal immigrants were increasingly targeted by law enforcement, virtually every state in the nation witnessed a decline in the number of undocumented Americans.

Every state, that is, but Georgia.

Georgia added 20,000 immigrants without papers in 2008, according to a surprising study by the U.S. Department of Homeland Security. Georgia’s unauthorized immigrant population rose 4 percent from 460,000 to 480,000.

Meanwhile, across the United States that year, the number of undocumented residents declined from 11.6 million to 10.8 million – a 7 percent drop.