-2.62% is the change from 839 to 817
Calculation steps:
[( 817 - 839 ) ÷ 839] x 100 = -2.62%
Formula
Percentage change = [(817 - 839) / 839] x 100
Subtract the new number by the original number
817 - 839 = -22
-22 ÷ 839 = -0.026221692491060787
-0.026221692491060787 x 100 = -2.62%