-18.09% is the change from 398 to 326
Calculation steps:
[( 326 - 398 ) ÷ 398] x 100 = -18.09%
Formula
Percentage change = [(326 - 398) / 398] x 100
Subtract the new number by the original number
326 - 398 = -72
-72 ÷ 398 = -0.18090452261306533
-0.18090452261306533 x 100 = -18.09%