By KELIN DILLON Halfway through the six-year administration of Mexican President Andrés Manuel López Obrador (AMLO), Mexico’s state-owned oil company Petróleos Mexicanos (Pemex) has lost 38.4 percent of its stake in the world’s energy market, dropping out of the top 10 most important international oil companies. Just in 2017, Pemex ranked highly in value according to British firm Brand Finance’s