-51.07% is the change from 656 to 321
Calculation steps:
[( 321 - 656 ) ÷ 656] x 100 = -51.07%
Formula
Percentage change = [(321 - 656) / 656] x 100
Subtract the new number by the original number
321 - 656 = -335
-335 ÷ 656 = -0.510670731707317
-0.510670731707317 x 100 = -51.07%