Back series GDP data proved UPA years best: P Chidambaram 
Former Finance Minister P Chidambaram has said the "back series calculation of GDP has proved that the best years of economic growth were the UPA years 2004-2014". India's economy grew in double digits twice during the previous UPA regime under Prime Minister Manmohan Singh, 10.23% in 2007-08 and 10.78% in 2010-11, according to the recently released Ministry of Statistics' data.