In 1994, Petrobras put the Petrobras 36, the world's largest oil platform, into service. It sank after an explosion in 2001 and was a complete loss. In 1997, the government approved Law N.9.478, which broke Petrobras's monopoly and allowed competition in Brazil's oilfields, and also created the national petroleum agency Agência Nacional do Petróleo, (ANP) responsible for the regulation and supervision of the petroleum industry, and the National Council of Energy Policies, a public agency responsible for developing public energy policy. In 1999, the National Petroleum Agency signed agreements with other companies, ending the company's monopoly.