-81.88% is the change from 999 to 181
Calculation steps:
[( 181 - 999 ) ÷ 999] x 100 = -81.88%
Formula
Percentage change = [(181 - 999) / 999] x 100
Subtract the new number by the original number
181 - 999 = -818
-818 ÷ 999 = -0.8188188188188188
-0.8188188188188188 x 100 = -81.88%