-86.51% is the change from 949 to 128
Calculation steps:
[( 128 - 949 ) ÷ 949] x 100 = -86.51%
Formula
Percentage change = [(128 - 949) / 949] x 100
Subtract the new number by the original number
128 - 949 = -821
-821 ÷ 949 = -0.8651211801896733
-0.8651211801896733 x 100 = -86.51%