-33.03% is the change from 999 to 669
Calculation steps:
[( 669 - 999 ) ÷ 999] x 100 = -33.03%
Formula
Percentage change = [(669 - 999) / 999] x 100
Subtract the new number by the original number
669 - 999 = -330
-330 ÷ 999 = -0.3303303303303303
-0.3303303303303303 x 100 = -33.03%