Your data is somewhat dated. I worry about the oncoming inflation. Due to the current economics of our society (and world, for that matter), many experts are predicting double digit inflation beginning as early as 2014. Needless to say, that concerns me.
4% is typical long term HISTORICALLY.
Given the spendthrift ways of our government, a currency collapse with hyper inflation is possible.
However, I am assuming a resumption of fiscally sound government.