-7.7% is the change from 909 to 839
Calculation steps:
[( 839 - 909 ) ÷ 909] x 100 = -7.7%
Formula
Percentage change = [(839 - 909) / 909] x 100
Subtract the new number by the original number
839 - 909 = -70
-70 ÷ 909 = -0.07700770077007701
-0.07700770077007701 x 100 = -7.7%