-75.08% is the change from 999 to 249
Calculation steps:
[( 249 - 999 ) ÷ 999] x 100 = -75.08%
Formula
Percentage change = [(249 - 999) / 999] x 100
Subtract the new number by the original number
249 - 999 = -750
-750 ÷ 999 = -0.7507507507507507
-0.7507507507507507 x 100 = -75.08%