-58.71% is the change from 821 to 339
Calculation steps:
[( 339 - 821 ) ÷ 821] x 100 = -58.71%
Formula
Percentage change = [(339 - 821) / 821] x 100
Subtract the new number by the original number
339 - 821 = -482
-482 ÷ 821 = -0.587088915956151
-0.587088915956151 x 100 = -58.71%