-0.24% is the change from 839 to 837
Calculation steps:
[( 837 - 839 ) ÷ 839] x 100 = -0.24%
Formula
Percentage change = [(837 - 839) / 839] x 100
Subtract the new number by the original number
837 - 839 = -2
-2 ÷ 839 = -0.0023837902264600714
-0.0023837902264600714 x 100 = -0.24%