I've used these:
Manchester United - Transfer League
They don't match up - those at my link seem to not include add-ons, and are hence generally lower.
Short version, that adds up to +150 million at your resource and +104 million on mine for 14/15, and +54 million on yours and +28 million on mine for 15/16.
And none of the these even factor in wages or things like agent's fees, I would think.
Guess the lesson is that we should be careful bandying figures about, and that there's not really any clear consensual definition of what basis the figures need to be on.
I'll accept the transfermarkt figures as more relevant though, as they seem to be on a more inclusive basis.