-19.42% is the change from 829 to 668
Calculation steps:
[( 668 - 829 ) ÷ 829] x 100 = -19.42%
Formula
Percentage change = [(668 - 829) / 829] x 100
Subtract the new number by the original number
668 - 829 = -161
-161 ÷ 829 = -0.1942098914354644
-0.1942098914354644 x 100 = -19.42%