-4.09% is the change from 318 to 305
Calculation steps:
[( 305 - 318 ) ÷ 318] x 100 = -4.09%
Formula
Percentage change = [(305 - 318) / 318] x 100
Subtract the new number by the original number
305 - 318 = -13
-13 ÷ 318 = -0.040880503144654086
-0.040880503144654086 x 100 = -4.09%