has its own elected bodies. From 1948 to 1993 the President of the Province of Mantua was chosen by the members of the Provincial Council, elected every five years by citizens. From 1993 to 2016, under provisions of the 1993 local administration reform, the President of the Province was chosen by popular election, originally every four, then every five years. On 3 April 2014, the Italian Chamber of Deputies gave its final approval to the Law n.56/2014 which involves the transformation of the Italian provinces into "institutional bodies of second level". According to the 2014 reform, each province is headed by a President (or Commissioner) assisted by a legislative body, the Provincial Council, and an executive body, the Provincial Executive. President (Commissioner) and members of Council are elected together by mayors and city councilors of each municipality of the province respectively every four and two years. The Executive is chaired by the President (Commissioner) who appoint others members, called assessori. Since 2016, the President (Commissioner) and other members of the Council do not receive a salary. In each province, there is also a Prefect (prefetto), a representative of the central government who heads an agency called prefettura-ufficio territoriale del governo. The Questor (questore) is the head of State's Police (Polizia di Stato) in the province and his office is called questura. There is also a province's police force depending from local government, called provincial police (polizia provinciale). This is a partial list of the Presidents of the Province since 1975: Notes Economy Despite Mantuan landscape is primarily an agricultural one and the primary sector accounted for the 6% of local GDP in 2003, much above Italian average, the province has an historically strong industrial sector, which accounts for 37% of the GDP, while the tertiary sector holds the remaining 56%. Overall, the gross domestic product of the province was estimated in 2003 at over €10 billion. The productivity of agriculture is enhanced by a well-developed use of fertilizers and the traditional abundance of water. It is largely flat and the soil is very fertile and is intensively irrigated, boosted since the Middle Ages by the construction of a wide net of irrigation canals which were partly designed by Leonardo da Vinci. Crops grown include wheat, maize, rice, sugar beet, potatoes and vegetables. Olives, grapes, chestnuts and many other sorts of fruit are grown; mulberry plants are grown for their contribution