-16.79% is the change from 798 to 664
Calculation steps:
[( 664 - 798 ) ÷ 798] x 100 = -16.79%
Formula
Percentage change = [(664 - 798) / 798] x 100
Subtract the new number by the original number
664 - 798 = -134
-134 ÷ 798 = -0.16791979949874686
-0.16791979949874686 x 100 = -16.79%