-80.28% is the change from 649 to 128
Calculation steps:
[( 128 - 649 ) ÷ 649] x 100 = -80.28%
Formula
Percentage change = [(128 - 649) / 649] x 100
Subtract the new number by the original number
128 - 649 = -521
-521 ÷ 649 = -0.802773497688752
-0.802773497688752 x 100 = -80.28%