Iraq shakes up rankings of oil nations. Who's on top?

When Iraq raised its estimate of proven oil reserves Monday, the world had to revise the list of nations with the most reserves. Not counting Canada's oil sands, here's a look at the new Top 5 nations:

1. Saudi Arabia: 264.6 billion barrels

AP/File
In this 2008 file photo, a Saudi man pays after fueling his vehicle at a gasoline station in Riyadh, Saudi Arabia. Even with Iraq's upwardly revised estimates, Saudi Arabia remains the No. 1 nation in terms of oil reserves.

The previous No. 1 among oil nations remains comfortably at the top of the heap. Oil represents more than 90 percent of of Saudi exports and almost 75 percent of its tax revenue. But with little change in reserves or production, some analysts believe Saudi Arabia is reaching its limits of production.

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