-12.31% is the change from 455 to 399
Calculation steps:
[( 399 - 455 ) ÷ 455] x 100 = -12.31%
Formula
Percentage change = [(399 - 455) / 455] x 100
Subtract the new number by the original number
399 - 455 = -56
-56 ÷ 455 = -0.12307692307692308
-0.12307692307692308 x 100 = -12.31%