-81.18% is the change from 829 to 156
Calculation steps:
[( 156 - 829 ) ÷ 829] x 100 = -81.18%
Formula
Percentage change = [(156 - 829) / 829] x 100
Subtract the new number by the original number
156 - 829 = -673
-673 ÷ 829 = -0.8118214716525934
-0.8118214716525934 x 100 = -81.18%