-16.81% is the change from 821 to 683
Calculation steps:
[( 683 - 821 ) ÷ 821] x 100 = -16.81%
Formula
Percentage change = [(683 - 821) / 821] x 100
Subtract the new number by the original number
683 - 821 = -138
-138 ÷ 821 = -0.16808769792935443
-0.16808769792935443 x 100 = -16.81%