-31.37% is the change from 966 to 663
Calculation steps:
[( 663 - 966 ) ÷ 966] x 100 = -31.37%
Formula
Percentage change = [(663 - 966) / 966] x 100
Subtract the new number by the original number
663 - 966 = -303
-303 ÷ 966 = -0.3136645962732919
-0.3136645962732919 x 100 = -31.37%