-61.65% is the change from 665 to 255
Calculation steps:
[( 255 - 665 ) ÷ 665] x 100 = -61.65%
Formula
Percentage change = [(255 - 665) / 665] x 100
Subtract the new number by the original number
255 - 665 = -410
-410 ÷ 665 = -0.6165413533834586
-0.6165413533834586 x 100 = -61.65%