-31.91% is the change from 981 to 668
Calculation steps:
[( 668 - 981 ) ÷ 981] x 100 = -31.91%
Formula
Percentage change = [(668 - 981) / 981] x 100
Subtract the new number by the original number
668 - 981 = -313
-313 ÷ 981 = -0.31906218144750254
-0.31906218144750254 x 100 = -31.91%