-20.27% is the change from 829 to 661
Calculation steps:
[( 661 - 829 ) ÷ 829] x 100 = -20.27%
Formula
Percentage change = [(661 - 829) / 829] x 100
Subtract the new number by the original number
661 - 829 = -168
-168 ÷ 829 = -0.20265379975874548
-0.20265379975874548 x 100 = -20.27%