-90.37% is the change from 218 to 21
Calculation steps:
[( 21 - 218 ) ÷ 218] x 100 = -90.37%
Formula
Percentage change = [(21 - 218) / 218] x 100
Subtract the new number by the original number
21 - 218 = -197
-197 ÷ 218 = -0.9036697247706422
-0.9036697247706422 x 100 = -90.37%