-1.81% is the change from 828 to 813
Calculation steps:
[( 813 - 828 ) ÷ 828] x 100 = -1.81%
Formula
Percentage change = [(813 - 828) / 828] x 100
Subtract the new number by the original number
813 - 828 = -15
-15 ÷ 828 = -0.018115942028985508
-0.018115942028985508 x 100 = -1.81%