-19.7% is the change from 396 to 318
Calculation steps:
[( 318 - 396 ) ÷ 396] x 100 = -19.7%
Formula
Percentage change = [(318 - 396) / 396] x 100
Subtract the new number by the original number
318 - 396 = -78
-78 ÷ 396 = -0.19696969696969696
-0.19696969696969696 x 100 = -19.7%