-11.72% is the change from 930 to 821
Calculation steps:
[( 821 - 930 ) ÷ 930] x 100 = -11.72%
Formula
Percentage change = [(821 - 930) / 930] x 100
Subtract the new number by the original number
821 - 930 = -109
-109 ÷ 930 = -0.11720430107526882
-0.11720430107526882 x 100 = -11.72%