-19.06% is the change from 829 to 671
Calculation steps:
[( 671 - 829 ) ÷ 829] x 100 = -19.06%
Formula
Percentage change = [(671 - 829) / 829] x 100
Subtract the new number by the original number
671 - 829 = -158
-158 ÷ 829 = -0.19059107358262967
-0.19059107358262967 x 100 = -19.06%