-56.57% is the change from 990 to 430
Calculation steps:
[( 430 - 990 ) ÷ 990] x 100 = -56.57%
Formula
Percentage change = [(430 - 990) / 990] x 100
Subtract the new number by the original number
430 - 990 = -560
-560 ÷ 990 = -0.5656565656565656
-0.5656565656565656 x 100 = -56.57%