-30.94% is the change from 960 to 663
Calculation steps:
[( 663 - 960 ) ÷ 960] x 100 = -30.94%
Formula
Percentage change = [(663 - 960) / 960] x 100
Subtract the new number by the original number
663 - 960 = -297
-297 ÷ 960 = -0.309375
-0.309375 x 100 = -30.94%