-61.04% is the change from 657 to 256
Calculation steps:
[( 256 - 657 ) ÷ 657] x 100 = -61.04%
Formula
Percentage change = [(256 - 657) / 657] x 100
Subtract the new number by the original number
256 - 657 = -401
-401 ÷ 657 = -0.6103500761035008
-0.6103500761035008 x 100 = -61.04%