Now consider them in context:
1) 2.2 percent is the average interest rate on the U.S. Treasury’s marketable and non-marketable debt (February data).
2) 62.8 months is the average maturity of the Treasury’s marketable debt (fourth quarter 2011).
3) $454 billion is the interest expense on publicly held debt in fiscal 2011, which ended Sept. 30.
4) $5.9 trillion is the amount of debt coming due in the next five years.