-80.23% is the change from 688 to 136
Calculation steps:
[( 136 - 688 ) ÷ 688] x 100 = -80.23%
Formula
Percentage change = [(136 - 688) / 688] x 100
Subtract the new number by the original number
136 - 688 = -552
-552 ÷ 688 = -0.8023255813953488
-0.8023255813953488 x 100 = -80.23%