-76.98% is the change from 999 to 230
Calculation steps:
[( 230 - 999 ) ÷ 999] x 100 = -76.98%
Formula
Percentage change = [(230 - 999) / 999] x 100
Subtract the new number by the original number
230 - 999 = -769
-769 ÷ 999 = -0.7697697697697697
-0.7697697697697697 x 100 = -76.98%