-73.81% is the change from 821 to 215
Calculation steps:
[( 215 - 821 ) ÷ 821] x 100 = -73.81%
Formula
Percentage change = [(215 - 821) / 821] x 100
Subtract the new number by the original number
215 - 821 = -606
-606 ÷ 821 = -0.7381242387332522
-0.7381242387332522 x 100 = -73.81%