-51.41% is the change from 817 to 397
Calculation steps:
[( 397 - 817 ) ÷ 817] x 100 = -51.41%
Formula
Percentage change = [(397 - 817) / 817] x 100
Subtract the new number by the original number
397 - 817 = -420
-420 ÷ 817 = -0.5140758873929009
-0.5140758873929009 x 100 = -51.41%