-15.83% is the change from 821 to 691
Calculation steps:
[( 691 - 821 ) ÷ 821] x 100 = -15.83%
Formula
Percentage change = [(691 - 821) / 821] x 100
Subtract the new number by the original number
691 - 821 = -130
-130 ÷ 821 = -0.15834348355663824
-0.15834348355663824 x 100 = -15.83%