22 if you dont count the same champions at different roles. They are:
(top)
(jungle) 
(mid) 
(top)
(adc) (top)
(top)
(top)
(top) 
(support)
I know that winrate isnt everthing but I think this might be too many Riot...
http://champion.gg/statistics/#?sortBy=general.winPercent&order=descend
venomous frost2 votesmost of these champions are only played by one trick ponies, thus having a distorted winrate.
i mean cmon, who the fk plays heimer/fiddle/rammus/arelion sol/khartus/galio/kayle/quinn
L8t1 votesYes these statistics are skewed especially since its taken from higher elo where the playerbases are much more devoted to the champ
The Bearded Bard1 votesI have a 100% winrate as bot lane marksman Swain.
Reikken1 votesAccording to na.op.gg, the top lane champ with the highest winrate in 6.13 was Annie
Reaper Soraka1 votesJust add a screen capture of it next time. you kinda made that really hard to read.
