-17.02% is the change from 999 to 829
Calculation steps:
[( 829 - 999 ) ÷ 999] x 100 = -17.02%
Formula
Percentage change = [(829 - 999) / 999] x 100
Subtract the new number by the original number
829 - 999 = -170
-170 ÷ 999 = -0.17017017017017017
-0.17017017017017017 x 100 = -17.02%