-19.69% is the change from 828 to 665
Calculation steps:
[( 665 - 828 ) ÷ 828] x 100 = -19.69%
Formula
Percentage change = [(665 - 828) / 828] x 100
Subtract the new number by the original number
665 - 828 = -163
-163 ÷ 828 = -0.19685990338164253
-0.19685990338164253 x 100 = -19.69%