-2.26% is the change from 798 to 780
Calculation steps:
[( 780 - 798 ) ÷ 798] x 100 = -2.26%
Formula
Percentage change = [(780 - 798) / 798] x 100
Subtract the new number by the original number
780 - 798 = -18
-18 ÷ 798 = -0.022556390977443608
-0.022556390977443608 x 100 = -2.26%