-17.29% is the change from 798 to 660
Calculation steps:
[( 660 - 798 ) ÷ 798] x 100 = -17.29%
Formula
Percentage change = [(660 - 798) / 798] x 100
Subtract the new number by the original number
660 - 798 = -138
-138 ÷ 798 = -0.17293233082706766
-0.17293233082706766 x 100 = -17.29%