-81.18% is the change from 680 to 128
Calculation steps:
[( 128 - 680 ) ÷ 680] x 100 = -81.18%
Formula
Percentage change = [(128 - 680) / 680] x 100
Subtract the new number by the original number
128 - 680 = -552
-552 ÷ 680 = -0.8117647058823529
-0.8117647058823529 x 100 = -81.18%