2.68% is the change from 821 to 843
Calculation steps:
[( 843 - 821 ) ÷ 821] x 100 = 2.68%
Formula
Percentage change = [(843 - 821) / 821] x 100
Subtract the new number by the original number
843 - 821 = 22
22 ÷ 821 = 0.02679658952496955
0.02679658952496955 x 100 = 2.68%