-87.75% is the change from 808 to 99
Calculation steps:
[( 99 - 808 ) ÷ 808] x 100 = -87.75%
Formula
Percentage change = [(99 - 808) / 808] x 100
Subtract the new number by the original number
99 - 808 = -709
-709 ÷ 808 = -0.8774752475247525
-0.8774752475247525 x 100 = -87.75%