-90.58% is the change from 191 to 18
Calculation steps:
[( 18 - 191 ) ÷ 191] x 100 = -90.58%
Formula
Percentage change = [(18 - 191) / 191] x 100
Subtract the new number by the original number
18 - 191 = -173
-173 ÷ 191 = -0.9057591623036649
-0.9057591623036649 x 100 = -90.58%