The National Sample Survey Office (NSSO) has started the exercise to map all the service establishments across the country to frame a better picture of this segment of the economy that accounts for about 60 percent of GDP. The establishment-focused survey on the services sector could gradually pave the way for an Annual Survey of Services. The exercise is a part of the NSSO's 74th round and is being carried out from July 1 this year to June 30 next year. "It is focussed on service sector enterprises. Both national accounts division and other users have been asking for richer data on the services sector," said TCA Anant, Secretary, Ministry of Statistics and Programme Implementation. The sector has also remained an outlier at times and has largely grown at a robust pace even when the overall economic growth may not have been buoyant.