-18.22% is the change from 999 to 817
Calculation steps:
[( 817 - 999 ) ÷ 999] x 100 = -18.22%
Formula
Percentage change = [(817 - 999) / 999] x 100
Subtract the new number by the original number
817 - 999 = -182
-182 ÷ 999 = -0.18218218218218218
-0.18218218218218218 x 100 = -18.22%