Working Day Adjusted Change of Total Output. Volume figures are at previous year's prices, in which the previous year is always the base year. Volume changes at previous year's prices are used to chain a continuous volume series at reference year 2000 prices with the so-called annual overlap method. This series is published as the Trend Indicator of Output. This method corresponds to the deflation and chaining method applied to quarterly accounts output. Services comprise trade, hotel and restaurant industries, transport and business activities as well as real estate, renting and research services, financial intermediation and insurance, and public services. Primary production refers to agriculture, forestry and fishery.