-81.33% is the change from 391 to 73
Calculation steps:
[( 73 - 391 ) ÷ 391] x 100 = -81.33%
Formula
Percentage change = [(73 - 391) / 391] x 100
Subtract the new number by the original number
73 - 391 = -318
-318 ÷ 391 = -0.8132992327365729
-0.8132992327365729 x 100 = -81.33%