-2.54% is the change from 828 to 807
Calculation steps:
[( 807 - 828 ) ÷ 828] x 100 = -2.54%
Formula
Percentage change = [(807 - 828) / 828] x 100
Subtract the new number by the original number
807 - 828 = -21
-21 ÷ 828 = -0.025362318840579712
-0.025362318840579712 x 100 = -2.54%