-79.95% is the change from 813 to 163
Calculation steps:
[( 163 - 813 ) ÷ 813] x 100 = -79.95%
Formula
Percentage change = [(163 - 813) / 813] x 100
Subtract the new number by the original number
163 - 813 = -650
-650 ÷ 813 = -0.7995079950799509
-0.7995079950799509 x 100 = -79.95%