-87.17% is the change from 998 to 128
Calculation steps:
[( 128 - 998 ) ÷ 998] x 100 = -87.17%
Formula
Percentage change = [(128 - 998) / 998] x 100
Subtract the new number by the original number
128 - 998 = -870
-870 ÷ 998 = -0.8717434869739479
-0.8717434869739479 x 100 = -87.17%