<Tr> <Td> Venezuela </Td> <Td> Americas </Td> <Td> 1960--</Td> <Td> 29,275,460 </Td> <Td> 912,050 </Td> <Td> 2,276,967 </Td> <Td> 299,953,000,000 </Td> </Tr> <Tr> <Th_colspan="3"> OPEC Total </Th> <Th> 452,127,152 </Th> <Th> 12,150,695 </Th> <Th> 35,221,740 </Th> <Th> 1,209,103,000,000 </Th> </Tr> <Tr> <Th_colspan="3"> World Total </Th> <Th> 7,256,490,011 </Th> <Th> 510,072,000 </Th> <Th> 80,622,287 </Th> <Th> 1,650,585,000,000 </Th> </Tr> <Tr> <Th_colspan="3"> OPEC Percent </Th> <Th> 6% </Th> <Th> 2% </Th> <Th> 44% </Th> <Th> 73% </Th> </Tr>

What is opec and why is it important