-89.45% is the change from 199 to 21
Calculation steps:
[( 21 - 199 ) ÷ 199] x 100 = -89.45%
Formula
Percentage change = [(21 - 199) / 199] x 100
Subtract the new number by the original number
21 - 199 = -178
-178 ÷ 199 = -0.8944723618090452
-0.8944723618090452 x 100 = -89.45%