-72.07% is the change from 999 to 279
Calculation steps:
[( 279 - 999 ) ÷ 999] x 100 = -72.07%
Formula
Percentage change = [(279 - 999) / 999] x 100
Subtract the new number by the original number
279 - 999 = -720
-720 ÷ 999 = -0.7207207207207207
-0.7207207207207207 x 100 = -72.07%