In 2006, the primary economic concerns have centered around: high national debt ($9 trillion), high corporate debt ($9 trillion), high mortgage debt ($9 trillion), high unfunded Medicare liability ($30 trillion), high unfunded Social Security liability ($12 trillion), high external debt (amount owed to foreign lenders) and a serious deterioration in the United States net international investment position (NIIP) (-24% of GDP),[6] high trade deficits, and a rise in illegal immigration.