-77.78% is the change from 999 to 222
Calculation steps:
[( 222 - 999 ) ÷ 999] x 100 = -77.78%
Formula
Percentage change = [(222 - 999) / 999] x 100
Subtract the new number by the original number
222 - 999 = -777
-777 ÷ 999 = -0.7777777777777778
-0.7777777777777778 x 100 = -77.78%