Federer is the highest endorsed athlete in the world

Any one of our resident statisticians/number enthusiants want to make a plot of annual earnings vs. time for Federer, Novak, and Nadal?

It seems like Nadal's worth is curiously not appreciating like Federer's and Novak's have. Begs the question as to whether people may not be that impressed with all of Nadal's clay court titles.
 
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