None of them are known.
They are confidential. Player agents often leak amounts for their journo buddies to publish, for one reason or another.
Clubs might even leak a dollar figure for an offer they've made that was rejected.
Clubs don't publicly deny rumoured amounts, because if they did they'd have to deny all of them. Otherwise the implication would be that the one not denied was true.
As for the accuracy of any of the published-and-repeated-ad-infintum-as-fact rumours, maybe ask
@Ryan (who by chance once came across an actual player's contract!)