-16.92% is the change from 798 to 663
Calculation steps:
[( 663 - 798 ) ÷ 798] x 100 = -16.92%
Formula
Percentage change = [(663 - 798) / 798] x 100
Subtract the new number by the original number
663 - 798 = -135
-135 ÷ 798 = -0.16917293233082706
-0.16917293233082706 x 100 = -16.92%