-81.18% is the change from 999 to 188
Calculation steps:
[( 188 - 999 ) ÷ 999] x 100 = -81.18%
Formula
Percentage change = [(188 - 999) / 999] x 100
Subtract the new number by the original number
188 - 999 = -811
-811 ÷ 999 = -0.8118118118118118
-0.8118118118118118 x 100 = -81.18%