I'm not sure why we're getting a lot who say "around 0%" and a lot who say "around 3%." Perhaps people are misreading the
chart, as I did until Fired@51 made me realize my mistake.
If you want to see how much prices increased in 2008, you'd look at the December number, which compares prices in Dec 2008 with those in Dec 2007 (they were .1% higher). You don't look at the average inflation rate for 2008 (3.85%).
I agree I wasn't that clear in the question. It should have gone more like this:
If you increase your spending allowance for the 2009 based on the inflation rate for the prior year (2008), what inflation rate are you using for 2008?