-25.7% is the change from 821 to 610
Calculation steps:
[( 610 - 821 ) ÷ 821] x 100 = -25.7%
Formula
Percentage change = [(610 - 821) / 821] x 100
Subtract the new number by the original number
610 - 821 = -211
-211 ÷ 821 = -0.2570036540803898
-0.2570036540803898 x 100 = -25.7%