0.24% is the change from 819 to 821
Calculation steps:
[( 821 - 819 ) ÷ 819] x 100 = 0.24%
Formula
Percentage change = [(821 - 819) / 819] x 100
Subtract the new number by the original number
821 - 819 = 2
2 ÷ 819 = 0.002442002442002442
0.002442002442002442 x 100 = 0.24%