-1.1% is the change from 821 to 812
Calculation steps:
[( 812 - 821 ) ÷ 821] x 100 = -1.1%
Formula
Percentage change = [(812 - 821) / 821] x 100
Subtract the new number by the original number
812 - 821 = -9
-9 ÷ 821 = -0.010962241169305725
-0.010962241169305725 x 100 = -1.1%