 2007 is taken as the base year for the study to be comparable with the WPI and CPI.It now covers  Delhi with NCR, Bangalore, Mumbai, Kolkata, Bhopal, Hyderabad, Faridabad, Patna, Ahmedabad, Chennai, Jaipur, Lucknow, Pune, Surat, Kochi, Bhubaneshwar, Guwahati, Ludhiana, Vijayawada, Indore, Chandigarh, Coimbatore, Dehradun, Meerut, Nagpur and Raipur.The index shows that the prices have doubled in cities like Mumbai, Delhi and Bhopal, but have declined in Hyderabad and Kochi.