-19.75% is the change from 319 to 256
Calculation steps:
[( 256 - 319 ) ÷ 319] x 100 = -19.75%
Formula
Percentage change = [(256 - 319) / 319] x 100
Subtract the new number by the original number
256 - 319 = -63
-63 ÷ 319 = -0.1974921630094044
-0.1974921630094044 x 100 = -19.75%