-5.92% is the change from 338 to 318
Calculation steps:
[( 318 - 338 ) ÷ 338] x 100 = -5.92%
Formula
Percentage change = [(318 - 338) / 338] x 100
Subtract the new number by the original number
318 - 338 = -20
-20 ÷ 338 = -0.05917159763313609
-0.05917159763313609 x 100 = -5.92%