SPOKANE - Idaho was among seven states where the number of unauthorized immigrants increased between 2009 and 2012, according to a report released Tuesday by the Pew Research Center.

The report also found the number of unauthorized immigrants decreased in 14 states, including Oregon, in that time period. The number stayed relatively stable in the remaining states, including Washington.

Nationally, the number of unauthorized immigrants remained stable at 11.2 million between 2009 and 2012, the report found. The number of such immigrants peaked in 2007 at 12.2 million, the report stated.

But changes occurred within states. Idaho, for instance, grew from 35,000 unauthorized immigrants in 2009 to 50,000 in 2012, an increase of 15,000 people. Idaho's growth was "driven by increases in unauthorized immigrants from countries other than Mexico," the report stated.

Other states that saw increases were Florida, Maryland, Nebraska, New Jersey, Pennsylvania and Virginia, the report stated.

Meanwhile, Oregon saw the number of unauthorized immigrants drop from 140,000 in 2009 to 120,000 in 2012, a decrease of 20,000 people.

In most states, the losses "were due to drops in the number of unauthorized immigrants from Mexico," the report stated.

While Washington did not gain or lose a significant number of unauthorized immigrants, the state ranked 12th in the total number of such people living within its borders. There were 230,000 unauthorized immigrants living in Washington in 2012. California had the greatest number, at 2.4 million, the report found.

Washington also ranked 15th in the number of unauthorized immigrants in the labor force in 2012, at 4.9 percent. Nevada has the largest percentage in the labor force at 10.2 percent.

The report also showed the long-term growth in unauthorized immigrants in each state.

Idaho grew from 10,000 unauthorized immigrants in 1990 to 50,000 in 2012; Oregon grew from 25,000 in 1990 to 120,000 in 2012; and Washington grew from 40,000 in 1990 to 230,000 in 2012.

Officials said they wouldn't consider earlier plan.