-20.19% is the change from 832 to 664
Calculation steps:
[( 664 - 832 ) ÷ 832] x 100 = -20.19%
Formula
Percentage change = [(664 - 832) / 832] x 100
Subtract the new number by the original number
664 - 832 = -168
-168 ÷ 832 = -0.20192307692307693
-0.20192307692307693 x 100 = -20.19%