Don't worry

Sure, but percent change from 1 year prior is still well below historical norms.
If you want to look at the data in other ways, you can play with the view here:
http://research.stlouisfed.org/fred2/series/TCMDODebt growth has slowed and remains slow. Everything will look exponential if you look at it in nominal terms because the dollar has devalued exponentially.
Debt growth has continued and remains huge. Everything will look ok if you look at it from an exponentially devaluing dollar... but this isn't sustainable and it will end.