-74.42% is the change from 821 to 210
Calculation steps:
[( 210 - 821 ) ÷ 821] x 100 = -74.42%
Formula
Percentage change = [(210 - 821) / 821] x 100
Subtract the new number by the original number
210 - 821 = -611
-611 ÷ 821 = -0.7442143727161997
-0.7442143727161997 x 100 = -74.42%