-0.6% is the change from 828 to 823
Calculation steps:
[( 823 - 828 ) ÷ 828] x 100 = -0.6%
Formula
Percentage change = [(823 - 828) / 828] x 100
Subtract the new number by the original number
823 - 828 = -5
-5 ÷ 828 = -0.006038647342995169
-0.006038647342995169 x 100 = -0.6%