-65.89% is the change from 645 to 220
Calculation steps:
[( 220 - 645 ) ÷ 645] x 100 = -65.89%
Formula
Percentage change = [(220 - 645) / 645] x 100
Subtract the new number by the original number
220 - 645 = -425
-425 ÷ 645 = -0.6589147286821705
-0.6589147286821705 x 100 = -65.89%