-51.75% is the change from 657 to 317
Calculation steps:
[( 317 - 657 ) ÷ 657] x 100 = -51.75%
Formula
Percentage change = [(317 - 657) / 657] x 100
Subtract the new number by the original number
317 - 657 = -340
-340 ÷ 657 = -0.517503805175038
-0.517503805175038 x 100 = -51.75%