-49.36% is the change from 628 to 318
Calculation steps:
[( 318 - 628 ) ÷ 628] x 100 = -49.36%
Formula
Percentage change = [(318 - 628) / 628] x 100
Subtract the new number by the original number
318 - 628 = -310
-310 ÷ 628 = -0.49363057324840764
-0.49363057324840764 x 100 = -49.36%