-19.24% is the change from 317 to 256
Calculation steps:
[( 256 - 317 ) ÷ 317] x 100 = -19.24%
Formula
Percentage change = [(256 - 317) / 317] x 100
Subtract the new number by the original number
256 - 317 = -61
-61 ÷ 317 = -0.19242902208201892
-0.19242902208201892 x 100 = -19.24%