-81.7% is the change from 399 to 73
Calculation steps:
[( 73 - 399 ) ÷ 399] x 100 = -81.7%
Formula
Percentage change = [(73 - 399) / 399] x 100
Subtract the new number by the original number
73 - 399 = -326
-326 ÷ 399 = -0.8170426065162907
-0.8170426065162907 x 100 = -81.7%