-81.4% is the change from 688 to 128
Calculation steps:
[( 128 - 688 ) ÷ 688] x 100 = -81.4%
Formula
Percentage change = [(128 - 688) / 688] x 100
Subtract the new number by the original number
128 - 688 = -560
-560 ÷ 688 = -0.813953488372093
-0.813953488372093 x 100 = -81.4%