-18.93% is the change from 391 to 317
Calculation steps:
[( 317 - 391 ) ÷ 391] x 100 = -18.93%
Formula
Percentage change = [(317 - 391) / 391] x 100
Subtract the new number by the original number
317 - 391 = -74
-74 ÷ 391 = -0.18925831202046037
-0.18925831202046037 x 100 = -18.93%