WSJ – Mexico’s proven oil and gas reserves fell by 3.1 percent last year to 13.02 billion barrels of crude-oil equivalent as national oil company Petróleos Mexicanos was unable to find new reserves to replace all the petroleum it took out of the ground last year.

http://www.wsj.com/articles/mexicos-oil-and-gas-reserves-fall-3-1-1426114644