-45.56% is the change from 990 to 539
Calculation steps:
[( 539 - 990 ) ÷ 990] x 100 = -45.56%
Formula
Percentage change = [(539 - 990) / 990] x 100
Subtract the new number by the original number
539 - 990 = -451
-451 ÷ 990 = -0.45555555555555555
-0.45555555555555555 x 100 = -45.56%