i can't really vouch that the information on this site is 100% accurate / legit but it seems to be.
Might be worth checking out if you're interested in knowing a bit more
http://www.brillig.com/debt_clock/
Although a lot of government spending is worthwhile and provides great value to the citizens of its country, nobody would debate that gov'ts are inefficient and often squander vast amounts of money on endeavors that create little to no value to most of its citizens.