-0.63% is the change from 319 to 317
Calculation steps:
[( 317 - 319 ) ÷ 319] x 100 = -0.63%
Formula
Percentage change = [(317 - 319) / 319] x 100
Subtract the new number by the original number
317 - 319 = -2
-2 ÷ 319 = -0.006269592476489028
-0.006269592476489028 x 100 = -0.63%