-3.58% is the change from 809 to 780
Calculation steps:
[( 780 - 809 ) ÷ 809] x 100 = -3.58%
Formula
Percentage change = [(780 - 809) / 809] x 100
Subtract the new number by the original number
780 - 809 = -29
-29 ÷ 809 = -0.03584672435105068
-0.03584672435105068 x 100 = -3.58%