Welcome to the forum (on Hui's reminder)......
Use secondary axis...this is how it should work for you...
Prepare column graph as usual, now since your %age are very low it wont be visible, so for timebeing increase any 1 of your %age manually to the extent that its visible. Click on the %age column, right click select Chart type change to Line graph, next doubl click on line graph - go to axis tab and select secondary axis...
That should be it, change the manully entered cell to the previous formula.
P.S: The %age parameters will now be shown on right side, so do remember to mention in the graphs to avoid confusion.