 Under the previous system, in effect since 2002, power was significantly devolved to the districts which were led by their own mayors, managing infrastructure and levying taxes, around 30% of which were passed to the city-wide authority.The changes, implemented with the goal of reducing bureaucracy and inefficiency, gave the city council much greater power including control of the budget.The districts ceased to be separate legal entities, their mayors being replaced by district executive administrators appointed by the national government.