-2.8% is the change from 821 to 798
Calculation steps:
[( 798 - 821 ) ÷ 821] x 100 = -2.8%
Formula
Percentage change = [(798 - 821) / 821] x 100
Subtract the new number by the original number
798 - 821 = -23
-23 ÷ 821 = -0.028014616321559074
-0.028014616321559074 x 100 = -2.8%