-82.68% is the change from 999 to 173
Calculation steps:
[( 173 - 999 ) ÷ 999] x 100 = -82.68%
Formula
Percentage change = [(173 - 999) / 999] x 100
Subtract the new number by the original number
173 - 999 = -826
-826 ÷ 999 = -0.8268268268268268
-0.8268268268268268 x 100 = -82.68%