-17.17% is the change from 798 to 661
Calculation steps:
[( 661 - 798 ) ÷ 798] x 100 = -17.17%
Formula
Percentage change = [(661 - 798) / 798] x 100
Subtract the new number by the original number
661 - 798 = -137
-137 ÷ 798 = -0.17167919799498746
-0.17167919799498746 x 100 = -17.17%