-97.88% is the change from 851 to 18
Calculation steps:
[( 18 - 851 ) ÷ 851] x 100 = -97.88%
Formula
Percentage change = [(18 - 851) / 851] x 100
Subtract the new number by the original number
18 - 851 = -833
-833 ÷ 851 = -0.9788484136310224
-0.9788484136310224 x 100 = -97.88%