The best free kick takers in football - statistics

Who are the statistically best free kick takers in football ?

The best top league free-kick taker in football is considered to be Juninho Pernambucano, because of the number of goals scored from the free-kicks. Top free-kick goalscorers are also Pele, Ronaldinho and David Beckham.

It would be interesting to see, who is the best free-kick taker by ratio free-kick attempts / goal scored.