-13.9% is the change from 971 to 836
Calculation steps:
[( 836 - 971 ) ÷ 971] x 100 = -13.9%
Formula
Percentage change = [(836 - 971) / 971] x 100
Subtract the new number by the original number
836 - 971 = -135
-135 ÷ 971 = -0.13903192584963955
-0.13903192584963955 x 100 = -13.9%