-68.58% is the change from 818 to 257
Calculation steps:
[( 257 - 818 ) ÷ 818] x 100 = -68.58%
Formula
Percentage change = [(257 - 818) / 818] x 100
Subtract the new number by the original number
257 - 818 = -561
-561 ÷ 818 = -0.6858190709046454
-0.6858190709046454 x 100 = -68.58%