-83.23% is the change from 829 to 139
Calculation steps:
[( 139 - 829 ) ÷ 829] x 100 = -83.23%
Formula
Percentage change = [(139 - 829) / 829] x 100
Subtract the new number by the original number
139 - 829 = -690
-690 ÷ 829 = -0.8323281061519904
-0.8323281061519904 x 100 = -83.23%