-17.39% is the change from 391 to 323
Calculation steps:
[( 323 - 391 ) ÷ 391] x 100 = -17.39%
Formula
Percentage change = [(323 - 391) / 391] x 100
Subtract the new number by the original number
323 - 391 = -68
-68 ÷ 391 = -0.17391304347826086
-0.17391304347826086 x 100 = -17.39%