Global Tower Crane Market Assessment, By Design [Top Slewing, Bottom Slewing], By Product [Flat Top, Hammerhead, Luffing Jib, Self-erecting], By Loading Capacity [Less than 5 tons, 6 to 20 tons, 21 to 50 tons, 51 to 80 tons, More than 80 tons], By End-user [Infrastructure, Construction, Energy & Power, Others], By Region, Opportunities and Forecast, 2017-2031F