-17.72% is the change from 999 to 822
Calculation steps:
[( 822 - 999 ) ÷ 999] x 100 = -17.72%
Formula
Percentage change = [(822 - 999) / 999] x 100
Subtract the new number by the original number
822 - 999 = -177
-177 ÷ 999 = -0.17717717717717718
-0.17717717717717718 x 100 = -17.72%