-62% is the change from 671 to 255
Calculation steps:
[( 255 - 671 ) ÷ 671] x 100 = -62%
Formula
Percentage change = [(255 - 671) / 671] x 100
Subtract the new number by the original number
255 - 671 = -416
-416 ÷ 671 = -0.6199701937406855
-0.6199701937406855 x 100 = -62%