-71.96% is the change from 913 to 256
Calculation steps:
[( 256 - 913 ) ÷ 913] x 100 = -71.96%
Formula
Percentage change = [(256 - 913) / 913] x 100
Subtract the new number by the original number
256 - 913 = -657
-657 ÷ 913 = -0.71960569550931
-0.71960569550931 x 100 = -71.96%