-73.2% is the change from 821 to 220
Calculation steps:
[( 220 - 821 ) ÷ 821] x 100 = -73.2%
Formula
Percentage change = [(220 - 821) / 821] x 100
Subtract the new number by the original number
220 - 821 = -601
-601 ÷ 821 = -0.7320341047503045
-0.7320341047503045 x 100 = -73.2%