How the oil market bounced back from a year of crisis

Oil prices have staged a rapid recovery since the biggest crisis to strike the energy industry in decades.

The Organization of the Petroleum Exporting Countries and its allies stepped in last spring to backstop the market by slashing production in the teeth of a collapse in crude prices. This week, the cartel is expected to reach a deal on unwinding some of those cuts.

Here is why U.S. crude prices have roared back above $60 a barrel from a low of minus $37.63 a barrel last April.