-3.58% is the change from 839 to 809
Calculation steps:
[( 809 - 839 ) ÷ 839] x 100 = -3.58%
Formula
Percentage change = [(809 - 839) / 839] x 100
Subtract the new number by the original number
809 - 839 = -30
-30 ÷ 839 = -0.03575685339690107
-0.03575685339690107 x 100 = -3.58%