-39.71% is the change from 549 to 331
Calculation steps:
[( 331 - 549 ) ÷ 549] x 100 = -39.71%
Formula
Percentage change = [(331 - 549) / 549] x 100
Subtract the new number by the original number
331 - 549 = -218
-218 ÷ 549 = -0.3970856102003643
-0.3970856102003643 x 100 = -39.71%