-34.35% is the change from 821 to 539
Calculation steps:
[( 539 - 821 ) ÷ 821] x 100 = -34.35%
Formula
Percentage change = [(539 - 821) / 821] x 100
Subtract the new number by the original number
539 - 821 = -282
-282 ÷ 821 = -0.34348355663824603
-0.34348355663824603 x 100 = -34.35%