Perspectives: A Helicopter Resale History® compiles The Official Helicopter Blue Book® pricing data from 1979 to present. Each data point combines all model years to show the helicopter models’ average resale prices for the first calendar quarter of each year. No adjustments have been made for inflation: 1979 values are given in 1979 dollars, 1989 values in 1989 dollars, and so on to present. All values are given in US dollars.