-80.78% is the change from 999 to 192
Calculation steps:
[( 192 - 999 ) ÷ 999] x 100 = -80.78%
Formula
Percentage change = [(192 - 999) / 999] x 100
Subtract the new number by the original number
192 - 999 = -807
-807 ÷ 999 = -0.8078078078078078
-0.8078078078078078 x 100 = -80.78%