-89.95% is the change from 199 to 20
Calculation steps:
[( 20 - 199 ) ÷ 199] x 100 = -89.95%
Formula
Percentage change = [(20 - 199) / 199] x 100
Subtract the new number by the original number
20 - 199 = -179
-179 ÷ 199 = -0.8994974874371859
-0.8994974874371859 x 100 = -89.95%