-55.66% is the change from 990 to 439
Calculation steps:
[( 439 - 990 ) ÷ 990] x 100 = -55.66%
Formula
Percentage change = [(439 - 990) / 990] x 100
Subtract the new number by the original number
439 - 990 = -551
-551 ÷ 990 = -0.5565656565656566
-0.5565656565656566 x 100 = -55.66%