-44.94% is the change from 999 to 550
Calculation steps:
[( 550 - 999 ) ÷ 999] x 100 = -44.94%
Formula
Percentage change = [(550 - 999) / 999] x 100
Subtract the new number by the original number
550 - 999 = -449
-449 ÷ 999 = -0.4494494494494494
-0.4494494494494494 x 100 = -44.94%