-33.73% is the change from 999 to 662
Calculation steps:
[( 662 - 999 ) ÷ 999] x 100 = -33.73%
Formula
Percentage change = [(662 - 999) / 999] x 100
Subtract the new number by the original number
662 - 999 = -337
-337 ÷ 999 = -0.33733733733733734
-0.33733733733733734 x 100 = -33.73%