-17.01% is the change from 817 to 678
Calculation steps:
[( 678 - 817 ) ÷ 817] x 100 = -17.01%
Formula
Percentage change = [(678 - 817) / 817] x 100
Subtract the new number by the original number
678 - 817 = -139
-139 ÷ 817 = -0.1701346389228886
-0.1701346389228886 x 100 = -17.01%