-13.63% is the change from 939 to 811
Calculation steps:
[( 811 - 939 ) ÷ 939] x 100 = -13.63%
Formula
Percentage change = [(811 - 939) / 939] x 100
Subtract the new number by the original number
811 - 939 = -128
-128 ÷ 939 = -0.13631522896698617
-0.13631522896698617 x 100 = -13.63%