-22.07% is the change from 829 to 646
Calculation steps:
[( 646 - 829 ) ÷ 829] x 100 = -22.07%
Formula
Percentage change = [(646 - 829) / 829] x 100
Subtract the new number by the original number
646 - 829 = -183
-183 ÷ 829 = -0.22074788902291917
-0.22074788902291917 x 100 = -22.07%