Studies on environmental income and expenditure statistics was started by TurkStat in 1998. The data have been compiled since 1997 with the aim of determining the environmental employment, revenue and expenditures firstly starting with the public institutions. Within this scope, in terms of public sector, data from public institutions, municipalities and private provincial administrations are compiled. As for business sector, data from enterprises operating at mining and quarrying, manufacturing industry and electricity, gas, steam and hot water production and distribution, water supply; sewerage, waste management and improvement activities and the other sectors and besides these, within the scope of specialist institutions, data from the general directorates of water and sewage works of the metropolitan municipalities, local administration unions and organized industrial zones are compiled. Since 2007, data have been compiled regularly every year from entrepreneurs, excluding year 2011.

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