-97.79% is the change from 813 to 18
Calculation steps:
[( 18 - 813 ) ÷ 813] x 100 = -97.79%
Formula
Percentage change = [(18 - 813) / 813] x 100
Subtract the new number by the original number
18 - 813 = -795
-795 ÷ 813 = -0.977859778597786
-0.977859778597786 x 100 = -97.79%