Old news.
Iraq has 25 million people. Oil is 96% of the Iraqi economy. Iraq produces 2 million bpd of oil when production is good. The price of oil over the last year has ranged from below 20 to about 40. At an average of $30 a barrel, that equals about 60 million dollars a day. With 365 days in a year, that equals about 21,900,000,000 dollars a year. If one assumes that there is some cost at producing oil, then one gets about 20 billion a year.
20 billion a year divided among 25 million people equals about 870 dollars a year per capita income.
Not very much.
These numbers are from memory, but they are fair approximations of what you'll find in the cia fact book.
The problem seems to be that most of it seems to have been spent on foreign contractors, with minimal results in terms of rebuilding infrastructure, improving health care or funding reconstruction by Iraqi businesses.