And as in other states where oil dominates the economy, Qatar's fortunes have followed those of the world oil market. The late 1980s and early 1990s were times of relative austerity, with development projects canceled or delayed. But those years were also a period of significant transition when Qatar began its shift from an economy reliant almost entirely on oil to one that would be supported by the exploitation of natural gas from the North Field, the world's largest natural gas field.