Great Chart.
Note that interest on the debt is 4.63%. That is the interest when the Fed and the Chinese are buying our debt at 2.5%. When (not if) interest rates go to their historic norm of about 7.5%, that cut of the total budget goes from 4.63% to over 13%. Then our debt goes up geometrically and then we go Greek.
God help us.
You remember the "crazy" man that ran for President many years back saying, "you don't finance long term debt at short term rates". Ross Perot would have fixed this long ago.