Gross domestic product (GDP) measures the final market value of all goods and services produced within a country. It is the most frequently used indicator of economic activity. The GDP by industry approach (or output-based GDP) is the sum of the gross value added (output less intermediate consumption) of all industry and services sectors of the economy (at basic prices), plus all taxes less subsidies on products. This concept is adjusted for inflation. The time-series as of 2011-2015 is calculated based on Constant 2010 Prices while the data from 2016.Q1, is calculated based on Constant 2015 Prices. National Bureau of Statistics does not release recalculated historical values but only provides data with different base years.