Since 1990, Montevideo has been partially decentralized into 18 areas; administration and services for each area is provided by its Zonal Community Center (''Centro Comunal Zonal'', CCZ), which is subordinate to the Municipality of Montevideo. The boundaries of the municipal districts of Montevideo were created on 12 July 1993, and successively amended on 19 October 1993, 6 June 1994 and 10 November 1994.