-84.18% is the change from 999 to 158
Calculation steps:
[( 158 - 999 ) ÷ 999] x 100 = -84.18%
Formula
Percentage change = [(158 - 999) / 999] x 100
Subtract the new number by the original number
158 - 999 = -841
-841 ÷ 999 = -0.8418418418418419
-0.8418418418418419 x 100 = -84.18%