-39.6% is the change from 909 to 549
Calculation steps:
[( 549 - 909 ) ÷ 909] x 100 = -39.6%
Formula
Percentage change = [(549 - 909) / 909] x 100
Subtract the new number by the original number
549 - 909 = -360
-360 ÷ 909 = -0.39603960396039606
-0.39603960396039606 x 100 = -39.6%