(Almost) 10 years of transfers... which position have we spaffed the most £ on?

The goal is to assess which position we have been best/worst at recruiting in, only counting players who were bought in the last 10 years - if a player was bought before 2010, they won't appear below even if they were sold during that period. Loan fees are included in the fees received. Of course, NOT buying a player also counts toward poor recruiting, and for players who are still at the club but likely to be sold in the future you'd have to estimate how much money we could bring in for...

(Almost) 10 years of transfers... which position have we spaffed the most £ on?