Who can answer my stupid question admittedly and real? Why Indonesia change to be fuel importer country?

Who can answer my stupid question admittedly and real? Why Indonesia as one of oil producer state finally exit from OPEC and now look for oil import from state yielding oil. Ironically in this time USA exploit m oil in Indonesia with the CAL-TEX company and is so also other states through British Petroleum and STANVAC. What is actually happened with Indonesia?