Since 1972, the city has been divided into administrative areas, called "municipi" (sing. "municipio") (until 2001 named "circoscrizioni"). They were created for administrative reasons to increase decentralisation in the city. Each "municipio" is governed by a president and a council of twenty-five members who are elected by its residents every five years. The "municipi" frequently cross the boundaries of the traditional, non-administrative divisions of the city. The municipi were originally 20, then 19, and in 2013, their number was reduced to 15.