-74.03% is the change from 828 to 215
Calculation steps:
[( 215 - 828 ) ÷ 828] x 100 = -74.03%
Formula
Percentage change = [(215 - 828) / 828] x 100
Subtract the new number by the original number
215 - 828 = -613
-613 ÷ 828 = -0.7403381642512077
-0.7403381642512077 x 100 = -74.03%