I hope you don't mind I edited your post and added 2019 forecast for the sake of illustrating my point below.
I beg to differ. With statistics it all depends upon one's frame of reference. In this case the last directors pay rise was in 2015, I presume for earnings growth over pervious years. Since that time EPS has fallen. You could make the case that in recent years this company has been a woeful performer in terms of lack of EPS growth. In fact forecast 2019 earnings per share are still some 10% lower than 2015 4 years ago !
Is it really such a surprise that the SP has gone backwards for years seeing as EPS has done the same in recent years ?