-84.31% is the change from 816 to 128
Calculation steps:
[( 128 - 816 ) ÷ 816] x 100 = -84.31%
Formula
Percentage change = [(128 - 816) / 816] x 100
Subtract the new number by the original number
128 - 816 = -688
-688 ÷ 816 = -0.8431372549019608
-0.8431372549019608 x 100 = -84.31%