-3.55% is the change from 817 to 788
Calculation steps:
[( 788 - 817 ) ÷ 817] x 100 = -3.55%
Formula
Percentage change = [(788 - 817) / 817] x 100
Subtract the new number by the original number
788 - 817 = -29
-29 ÷ 817 = -0.03549571603427173
-0.03549571603427173 x 100 = -3.55%