-61.35% is the change from 665 to 257
Calculation steps:
[( 257 - 665 ) ÷ 665] x 100 = -61.35%
Formula
Percentage change = [(257 - 665) / 665] x 100
Subtract the new number by the original number
257 - 665 = -408
-408 ÷ 665 = -0.6135338345864662
-0.6135338345864662 x 100 = -61.35%