-81.12% is the change from 678 to 128
Calculation steps:
[( 128 - 678 ) ÷ 678] x 100 = -81.12%
Formula
Percentage change = [(128 - 678) / 678] x 100
Subtract the new number by the original number
128 - 678 = -550
-550 ÷ 678 = -0.8112094395280236
-0.8112094395280236 x 100 = -81.12%