How can I manually set my leftAxis interval ?

[V00zi]

Currently I have set my maxY in a way that it always adjusts to the highest value of my list +5 so in this respect if my y axis value is something small like 10 or 12 the y axis interval becomes multiples of 2 (2,4,6) etc how can i explicitly define my interval to always be multiples of 5 (5,10,15) etc