Based on the given information:
As of August 22, 2007 the Debt Held by the Public 5,049,429,472,510.43, Intragovernmental Holdings 3,921,947,992,878.10, and Total Public Debt Outstanding 8,971,377,465,388.53
As of 04/17/2012, the Debt held by the Public is 10,903,987,805,036.21, Intragovernmental holdings 4,757,586,427,562.61, and the total public debt outstanding 15,661,574,232,598.82.
*Calculate the percentage change in the U.S. national debt since August 22, 2007 and analyze the figures.