-17.97% is the change from 818 to 671
Calculation steps:
[( 671 - 818 ) ÷ 818] x 100 = -17.97%
Formula
Percentage change = [(671 - 818) / 818] x 100
Subtract the new number by the original number
671 - 818 = -147
-147 ÷ 818 = -0.17970660146699266
-0.17970660146699266 x 100 = -17.97%