-21.38% is the change from 828 to 651
Calculation steps:
[( 651 - 828 ) ÷ 828] x 100 = -21.38%
Formula
Percentage change = [(651 - 828) / 828] x 100
Subtract the new number by the original number
651 - 828 = -177
-177 ÷ 828 = -0.213768115942029
-0.213768115942029 x 100 = -21.38%