UPDATE April 20, 2011: The below item has been so well-read in the almost four years since we first published it, we have produced an updated chart to depict the U.S. Energy Information Administration's most recent data on U.S. oil imports.

This time, instead of a one-month snapshot, however, we're showing annual totals by country, and the trend over several years. The chart below shows U.S. oil (and products) imports by country for the top 15 source countries during the six years beginning in 2005 and ending in 2010. For each country, the 2005 import volume is represented by the blue bar at the far left, and the 2010 import volume is represented by the orange bar at the far left.

The list and order of top 15 U.S. oil source countries has been remarkably stable over those six years, but it is possible to discern certain trends. So we can see, for example, that the portion of U.S. oil coming from Canada has been increasing, while Venezuela has exported less and less oil to the United States during this period. At the same time, the portion of oil being imported by the United States from these top 15 countries has increased relative to the other 99 countries from which the United States has imported at least some oil since 2005.

(Click here or on the chart to enlarge it.)