-50% is the change from 628 to 314
Calculation steps:
[( 314 - 628 ) ÷ 628] x 100 = -50%
Formula
Percentage change = [(314 - 628) / 628] x 100
Subtract the new number by the original number
314 - 628 = -314
-314 ÷ 628 = -0.5
-0.5 x 100 = -50%
Example