Wikipedia notes several recent changes to the debt ceiling. Increases in the debt ceiling allow the Treasury to borrow more money and increase the national debt to a level higher than previously allowed by law.
August 5, 1997 5,950 +450 Pub.L. 105–33
June 11, 2002 6,400 [26] +450 Pub.L. 107–199
May 27, 2003 7,384 +984 Pub.L. 108–24
November 16, 2004 8,184 [26] +800 Pub.L. 108–415
March 20, 2006 8,965 [27] +781 Pub.L. 109–182
September 29, 2007 9,815 +850 Pub.L. 110–91
June 5, 2008 10,615 +800 Pub.L. 110–289
October 3, 2008 11,315 [28] +700 Pub.L. 110–343
February 17, 2009 12,104 [29] +789 Pub.L. 111–5
December 24, 2009 12,394 +290 Pub.L. 111–123
February 12, 2010 14,294 +1,900 Pub.L. 111–139
January 30, 2012 16,394 +2,100
May 19, 2013 16,700
How much in interest payments since 2002, has the increase in borrowing from the previous debt ceiling of $5,950 billion to the new debt ceiling of $16,700 billion, cost the US?
Note: Only count additional interest payments on the debt from 2002-present due to the increased borrowing limit authorized by Congress, not all interest payments since 2002.