-17.15% is the change from 828 to 686
Calculation steps:
[( 686 - 828 ) ÷ 828] x 100 = -17.15%
Formula
Percentage change = [(686 - 828) / 828] x 100
Subtract the new number by the original number
686 - 828 = -142
-142 ÷ 828 = -0.17149758454106281
-0.17149758454106281 x 100 = -17.15%