-56.95% is the change from 597 to 257
Calculation steps:
[( 257 - 597 ) ÷ 597] x 100 = -56.95%
Formula
Percentage change = [(257 - 597) / 597] x 100
Subtract the new number by the original number
257 - 597 = -340
-340 ÷ 597 = -0.5695142378559463
-0.5695142378559463 x 100 = -56.95%