-64.3% is the change from 717 to 256
Calculation steps:
[( 256 - 717 ) ÷ 717] x 100 = -64.3%
Formula
Percentage change = [(256 - 717) / 717] x 100
Subtract the new number by the original number
256 - 717 = -461
-461 ÷ 717 = -0.6429567642956764
-0.6429567642956764 x 100 = -64.3%