-74.3% is the change from 821 to 211
Calculation steps:
[( 211 - 821 ) ÷ 821] x 100 = -74.3%
Formula
Percentage change = [(211 - 821) / 821] x 100
Subtract the new number by the original number
211 - 821 = -610
-610 ÷ 821 = -0.7429963459196103
-0.7429963459196103 x 100 = -74.3%