-49.7% is the change from 990 to 498
Calculation steps:
[( 498 - 990 ) ÷ 990] x 100 = -49.7%
Formula
Percentage change = [(498 - 990) / 990] x 100
Subtract the new number by the original number
498 - 990 = -492
-492 ÷ 990 = -0.49696969696969695
-0.49696969696969695 x 100 = -49.7%