-18.87% is the change from 408 to 331
Calculation steps:
[( 331 - 408 ) ÷ 408] x 100 = -18.87%
Formula
Percentage change = [(331 - 408) / 408] x 100
Subtract the new number by the original number
331 - 408 = -77
-77 ÷ 408 = -0.18872549019607843
-0.18872549019607843 x 100 = -18.87%
Example