Back in 1893, when Gareth Bale's great grand-father was probably knee-high to a grasshopper, the earliest recorded transfer fee was made. £100 was paid by Aston Villa to secure Willie Groves as a player. Since then, a lot has changed, but don't let us tell you - explore the data for yourself in this incredibly detailed interactive.Find out how many players were bought each year, by which countries and for how much by selecting different choices in the left-hand menu. If you want to watch the transformation through history just hit play on the video underneath the interactive.Who made this? Mac Bryla