According to Ind-Ra, country's most reputed credit rating agency, Medium-to-Heavy Commercial Vehicles (MHCV) have witnessed a continuous as well as alarming decline in sales over the years.
Links:
[1] http://admin.indiaenvironmentportal.org.in/news/commercial-vehicle-sales-india-have-witnessed-steep-decline-ind-ra
[2] http://admin.indiaenvironmentportal.org.in/category/newspaper/financial-express-new-delhi
[3] http://admin.indiaenvironmentportal.org.in/category/thesaurus/vehicles
[4] http://admin.indiaenvironmentportal.org.in/category/thesaurus/vehicular-pollution
[5] http://admin.indiaenvironmentportal.org.in/category/thesaurus/heavy-duty-vehicle
[6] http://admin.indiaenvironmentportal.org.in/category/thesaurus/bharat-stage-iv
[7] http://admin.indiaenvironmentportal.org.in/category/thesaurus/auto-industry
[8] http://admin.indiaenvironmentportal.org.in/category/thesaurus/electric-vehicles
[9] http://admin.indiaenvironmentportal.org.in/category/thesaurus/vehicle-technology-and-fuel
[10] http://admin.indiaenvironmentportal.org.in/category/thesaurus/air-pollution