-17.89% is the change from 313 to 257
Calculation steps:
[( 257 - 313 ) ÷ 313] x 100 = -17.89%
Formula
Percentage change = [(257 - 313) / 313] x 100
Subtract the new number by the original number
257 - 313 = -56
-56 ÷ 313 = -0.17891373801916932
-0.17891373801916932 x 100 = -17.89%