-73.69% is the change from 821 to 216
Calculation steps:
[( 216 - 821 ) ÷ 821] x 100 = -73.69%
Formula
Percentage change = [(216 - 821) / 821] x 100
Subtract the new number by the original number
216 - 821 = -605
-605 ÷ 821 = -0.7369062119366626
-0.7369062119366626 x 100 = -73.69%