Data calculated up to 2020 show some differences in comparison to data calculated up to 2014 (see 1st graph below). Unless it is the difference of methodology of the provider.
Question is: which is the best period to consider for having a hunch on what could happen concerning Coffee C particularly this year? My preference for Arabica is 5 years or 10 years data calculated up to end of 2020 (2nd graph below)...