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One in every five Pima County residents is now enrolled in a state health-insurance program for Arizona’s poorest residents.

As the economic downturn persisted in 2009, the state’s version of Medicaid added more than 200,000 people, including nearly 30,000 in Pima County.

It’s a significant, historic jump, state officials say. No state program in Arizona has grown faster than AHCCCS, the governor’s office says.

Between 2004 and 2008, the number of Pima County residents enrolled in the Arizona Health Care Cost Containment System jumped by 27 percent.

During that same period, the local population increased by about 13 percent.