-99.02% is the change from 817 to 8
Calculation steps:
[( 8 - 817 ) ÷ 817] x 100 = -99.02%
Formula
Percentage change = [(8 - 817) / 817] x 100
Subtract the new number by the original number
8 - 817 = -809
-809 ÷ 817 = -0.9902080783353733
-0.9902080783353733 x 100 = -99.02%