-31.51% is the change from 968 to 663
Calculation steps:
[( 663 - 968 ) ÷ 968] x 100 = -31.51%
Formula
Percentage change = [(663 - 968) / 968] x 100
Subtract the new number by the original number
663 - 968 = -305
-305 ÷ 968 = -0.31508264462809915
-0.31508264462809915 x 100 = -31.51%