That website is pretty awesome, i never knew about it before.

Interesting note

Naruto total episodes = 416 / Fillers = 178 which is ~43% fillers. Still in fillers for at least 10 more weeks.

Bleach total episodes = 303 / Fillers = 131 which is also ~43% fillers. Heading into filler arc

While One Piece total episodes = 482 / Fillers = 87 which is ~18% and have a few more episodes before ending the current arc.

Both Bleach and Naruto are from Studio Pierrot while One Piece is from Toei. I wonder if it's just a coincidence or does Studio Pierrot purposely keep their long running series on a certain total to fillers ratio.