idealist.org

Free publication, includes data

Lester R. Brown writes that in 1970, a bushel of wheat could be traded for a barrel of oil in the world market. It now takes nine bushels of wheat to buy a barrel of oil. The two countries most affected by the dramatically shifting terms of trade between grain and oil are the United States and Saudi Arabia.

The United States, the world's largest importer of oil and its largest exporter of grain, is paying for this shift in the wheat-oil exchange rate with higher gasoline prices. The nine-fold shift is also driving the largest U.S. trade deficit in history, which in turn is raising external debt to a record level, weakening the U.S. economy. In contrast, Saudi Arabia, the world's leading oil exporter and a high-ranking grain importer, is benefiting handsomely.

More at
http://www.earth-policy.org/Updates/Update38.htm