-20.02% is the change from 829 to 663
Calculation steps:
[( 663 - 829 ) ÷ 829] x 100 = -20.02%
Formula
Percentage change = [(663 - 829) / 829] x 100
Subtract the new number by the original number
663 - 829 = -166
-166 ÷ 829 = -0.20024125452352232
-0.20024125452352232 x 100 = -20.02%