-86.9% is the change from 977 to 128
Calculation steps:
[( 128 - 977 ) ÷ 977] x 100 = -86.9%
Formula
Percentage change = [(128 - 977) / 977] x 100
Subtract the new number by the original number
128 - 977 = -849
-849 ÷ 977 = -0.8689866939611054
-0.8689866939611054 x 100 = -86.9%