-2.16% is the change from 835 to 817
Calculation steps:
[( 817 - 835 ) ÷ 835] x 100 = -2.16%
Formula
Percentage change = [(817 - 835) / 835] x 100
Subtract the new number by the original number
817 - 835 = -18
-18 ÷ 835 = -0.02155688622754491
-0.02155688622754491 x 100 = -2.16%