BP stock prices again fell. By January 2007, the explosion, coupled with a pipeline spill in Alaska and production delays in the Gulf of Mexico, left BP's stock down 4.5% from its position prior to the Texas City explosion. However, by April 2007, stocks had rebounded 13% erasing the 8.3% loss from 2006. Declining oil prices and concerns over oil sustainability also caused shares to fall in value in late 2008. The Deepwater Horizon oil spill in April 2010 initiated a sharp decline in share prices, and BP's shares lost roughly 50% of their value in 50 days. BP's shares reached
Oil reserves in Mexico these problems, in September 2007, Mexico’s Congress approved reforms including a reduction in the taxes levied on Pemex. Most of Mexico's production decline involves one enormous oil field in the Gulf of Mexico. From 1979 to 2007, Mexico produced most of its oil from the supergiant Cantarell Field, which used to be the second-biggest oil field in the world by production. Because of falling production, in 1997 Pemex started a massive nitrogen injection project to maintain oil flow, which now consumes half the nitrogen produced in the world. As a result of nitrogen injection, production at Cantarell rose from in