-89.95% is the change from 209 to 21
Calculation steps:
[( 21 - 209 ) ÷ 209] x 100 = -89.95%
Formula
Percentage change = [(21 - 209) / 209] x 100
Subtract the new number by the original number
21 - 209 = -188
-188 ÷ 209 = -0.8995215311004785
-0.8995215311004785 x 100 = -89.95%