Short-Term Treasury Bills in 2009 Took Advantage of Historic Low Interest Rates to Reduce Interest Payments USA Inc. Outstanding Debt Breakdown by Type & Maturity, 2000 - 2010 i+) a a 100% T% aTIPS a Bonds Treasury Inflation 6% Protected Securities 5% - Long-Term (10+ Year Maturity) 4% a Notes - Medium-Term