-61.85% is the change from 671 to 256
Calculation steps:
[( 256 - 671 ) ÷ 671] x 100 = -61.85%
Formula
Percentage change = [(256 - 671) / 671] x 100
Subtract the new number by the original number
256 - 671 = -415
-415 ÷ 671 = -0.6184798807749627
-0.6184798807749627 x 100 = -61.85%