-89.81% is the change from 206 to 21
Calculation steps:
[( 21 - 206 ) ÷ 206] x 100 = -89.81%
Formula
Percentage change = [(21 - 206) / 206] x 100
Subtract the new number by the original number
21 - 206 = -185
-185 ÷ 206 = -0.8980582524271845
-0.8980582524271845 x 100 = -89.81%