-73.45% is the change from 821 to 218
Calculation steps:
[( 218 - 821 ) ÷ 821] x 100 = -73.45%
Formula
Percentage change = [(218 - 821) / 821] x 100
Subtract the new number by the original number
218 - 821 = -603
-603 ÷ 821 = -0.7344701583434835
-0.7344701583434835 x 100 = -73.45%