-7.86% is the change from 891 to 821
Calculation steps:
[( 821 - 891 ) ÷ 891] x 100 = -7.86%
Formula
Percentage change = [(821 - 891) / 891] x 100
Subtract the new number by the original number
821 - 891 = -70
-70 ÷ 891 = -0.07856341189674523
-0.07856341189674523 x 100 = -7.86%