-90.16% is the change from 813 to 80
Calculation steps:
[( 80 - 813 ) ÷ 813] x 100 = -90.16%
Formula
Percentage change = [(80 - 813) / 813] x 100
Subtract the new number by the original number
80 - 813 = -733
-733 ÷ 813 = -0.9015990159901599
-0.9015990159901599 x 100 = -90.16%