-32.73% is the change from 993 to 668
Calculation steps:
[( 668 - 993 ) ÷ 993] x 100 = -32.73%
Formula
Percentage change = [(668 - 993) / 993] x 100
Subtract the new number by the original number
668 - 993 = -325
-325 ÷ 993 = -0.32729103726082576
-0.32729103726082576 x 100 = -32.73%