-3.1% is the change from 839 to 813
Calculation steps:
[( 813 - 839 ) ÷ 839] x 100 = -3.1%
Formula
Percentage change = [(813 - 839) / 839] x 100
Subtract the new number by the original number
813 - 839 = -26
-26 ÷ 839 = -0.03098927294398093
-0.03098927294398093 x 100 = -3.1%