-78.82% is the change from 812 to 172
Calculation steps:
[( 172 - 812 ) ÷ 812] x 100 = -78.82%
Formula
Percentage change = [(172 - 812) / 812] x 100
Subtract the new number by the original number
172 - 812 = -640
-640 ÷ 812 = -0.7881773399014779
-0.7881773399014779 x 100 = -78.82%