0.24% is the change from 821 to 823
Calculation steps:
[( 823 - 821 ) ÷ 821] x 100 = 0.24%
Formula
Percentage change = [(823 - 821) / 821] x 100
Subtract the new number by the original number
823 - 821 = 2
2 ÷ 821 = 0.00243605359317905
0.00243605359317905 x 100 = 0.24%