Global Automotive Convertible Roof System Market Assessment, By Rooftop Type [Hardtop, Soft Top], By Vehicle Class [Luxury, Semi-luxury], By Body [Sedan, SUV, Roadster, Others], By Propulsion [ICE, BEV, PHEV, Others], Material [PVC, Aluminum, Glass, Others], By Region, Opportunities and Forecast, 2017-2031F