-89.53% is the change from 191 to 20
Calculation steps:
[( 20 - 191 ) ÷ 191] x 100 = -89.53%
Formula
Percentage change = [(20 - 191) / 191] x 100
Subtract the new number by the original number
20 - 191 = -171
-171 ÷ 191 = -0.8952879581151832
-0.8952879581151832 x 100 = -89.53%