-69.17% is the change from 999 to 308
Calculation steps:
[( 308 - 999 ) ÷ 999] x 100 = -69.17%
Formula
Percentage change = [(308 - 999) / 999] x 100
Subtract the new number by the original number
308 - 999 = -691
-691 ÷ 999 = -0.6916916916916916
-0.6916916916916916 x 100 = -69.17%