Like I said before Racedo, ryanairs shares trade in euro and easy jet trade in sterling. So that chart you have provided is wrong!
Er No
Ryanair is traded on London Stock Exchange as well as on Dublin and New York exchanges and for shares bought in UK you pay for the shares in Sterling, the shares are compared over the last 5 years on the sterling values so you can compare like with like.
Data is from LSE so if you disagree in their methods please feel free to take it up with them.
So can you please provide the details to back up your claim or were you just blowing smoke ?