-2.6% is the change from 809 to 788
Calculation steps:
[( 788 - 809 ) ÷ 809] x 100 = -2.6%
Formula
Percentage change = [(788 - 809) / 809] x 100
Subtract the new number by the original number
788 - 809 = -21
-21 ÷ 809 = -0.02595797280593325
-0.02595797280593325 x 100 = -2.6%