-2.29% is the change from 829 to 810
Calculation steps:
[( 810 - 829 ) ÷ 829] x 100 = -2.29%
Formula
Percentage change = [(810 - 829) / 829] x 100
Subtract the new number by the original number
810 - 829 = -19
-19 ÷ 829 = -0.022919179734620022
-0.022919179734620022 x 100 = -2.29%