-93.81% is the change from 339 to 21
Calculation steps:
[( 21 - 339 ) ÷ 339] x 100 = -93.81%
Formula
Percentage change = [(21 - 339) / 339] x 100
Subtract the new number by the original number
21 - 339 = -318
-318 ÷ 339 = -0.9380530973451328
-0.9380530973451328 x 100 = -93.81%