-64.2% is the change from 715 to 256
Calculation steps:
[( 256 - 715 ) ÷ 715] x 100 = -64.2%
Formula
Percentage change = [(256 - 715) / 715] x 100
Subtract the new number by the original number
256 - 715 = -459
-459 ÷ 715 = -0.641958041958042
-0.641958041958042 x 100 = -64.2%