-1.09% is the change from 828 to 819
Calculation steps:
[( 819 - 828 ) ÷ 828] x 100 = -1.09%
Formula
Percentage change = [(819 - 828) / 828] x 100
Subtract the new number by the original number
819 - 828 = -9
-9 ÷ 828 = -0.010869565217391304
-0.010869565217391304 x 100 = -1.09%