-86.26% is the change from 990 to 136
Calculation steps:
[( 136 - 990 ) ÷ 990] x 100 = -86.26%
Formula
Percentage change = [(136 - 990) / 990] x 100
Subtract the new number by the original number
136 - 990 = -854
-854 ÷ 990 = -0.8626262626262626
-0.8626262626262626 x 100 = -86.26%