-1.31% is the change from 839 to 828
Calculation steps:
[( 828 - 839 ) ÷ 839] x 100 = -1.31%
Formula
Percentage change = [(828 - 839) / 839] x 100
Subtract the new number by the original number
828 - 839 = -11
-11 ÷ 839 = -0.013110846245530394
-0.013110846245530394 x 100 = -1.31%