-64.49% is the change from 721 to 256
Calculation steps:
[( 256 - 721 ) ÷ 721] x 100 = -64.49%
Formula
Percentage change = [(256 - 721) / 721] x 100
Subtract the new number by the original number
256 - 721 = -465
-465 ÷ 721 = -0.6449375866851595
-0.6449375866851595 x 100 = -64.49%