This is OK for a blog post, but won't do for anything more for several reasons. First, for some reason, the FRED series only go back to 2003 for some reason (even though TIPS were first auctioned in January 1997). Second the matched series of real and nominal interest rates are not simple calculations from the prices of specific assets but "constant maturity" series based on estimation of a yield curve and interpolation. I don't know exactly how this is done and I should find out.
This little post (here because it is not up to www.angrybearblog.com standards) is a pathetic attempt to deal with the first problem by Googling. I was looking for older data on TIPS breakevens. Pu Shen at the Kansas City Fed wrote a working paper on the topic (warning pdf). Shen's point is that the breakeven inflation rate was low and variable and interprets the average excess returns on TIPS as compensation for their low liquidity. A constant difference would not be a problem, but the TIPS breakeven varied a lot while median Blue Chip survey expected inflation and actual achieved iflation changed very little.
Anyway I stole the graph (I don't have the numbers I just took a screen shot). The part from 2003 through 2006 is familiar from the FRED based post to which I link above. For comparison have a corresponding FRED graph of the average of CPI inflation and CPI minus food and energy inflation over the past year. The correlation in the period 1999-2003 was impressive if not perfect.