-0.25% is the change from 810 to 808
Calculation steps:
[( 808 - 810 ) ÷ 810] x 100 = -0.25%
Formula
Percentage change = [(808 - 810) / 810] x 100
Subtract the new number by the original number
808 - 810 = -2
-2 ÷ 810 = -0.0024691358024691358
-0.0024691358024691358 x 100 = -0.25%