I didnt said that there is some fixed ratio for zone . Home Zone Provides the ratio to zones on the way and thats very basic information and it solely depends on Home zone to provide whatever stop ratio they want to give to other on applicable grounds and the recieving zone utilises on their needs. And thats not my statistic its what is actually working :)
Example Case - KYQ YPR skipping VSKP,DVD both due to ECoR not utilising ratio for VSKP.