OK, i set it right in another way
axisY: { gridThickness: 0, lineThickness: 0, tickThickness: 0, margin: 0, minimum:0, maximum:1100,
minimum:0, was the key
https://jsfiddle.net/exoc37vq/ Infact i had added the link in my question.
(1000/1000)*100 = 100% (500/1000)*100 = 50% (900/1000)*100 = 90%