-13.98% is the change from 966 to 831
Calculation steps:
[( 831 - 966 ) ÷ 966] x 100 = -13.98%
Formula
Percentage change = [(831 - 966) / 966] x 100
Subtract the new number by the original number
831 - 966 = -135
-135 ÷ 966 = -0.13975155279503104
-0.13975155279503104 x 100 = -13.98%