-90.28% is the change from 813 to 79
Calculation steps:
[( 79 - 813 ) ÷ 813] x 100 = -90.28%
Formula
Percentage change = [(79 - 813) / 813] x 100
Subtract the new number by the original number
79 - 813 = -734
-734 ÷ 813 = -0.9028290282902829
-0.9028290282902829 x 100 = -90.28%