-19.19% is the change from 818 to 661
Calculation steps:
[( 661 - 818 ) ÷ 818] x 100 = -19.19%
Formula
Percentage change = [(661 - 818) / 818] x 100
Subtract the new number by the original number
661 - 818 = -157
-157 ÷ 818 = -0.19193154034229828
-0.19193154034229828 x 100 = -19.19%