How to resize objects to percent of artboard?

I would like to make an object 95% of the width and height of the artboard, but if I type 95% into the width/height of the transform window I am getting the width shrinking by 5% each time, or in other words instead of being 95% of the artboard it is 95% of the object each time.

Is there a way to change this to work similar to Photoshop where percentages resize objects to percentages of the canvas?