2.44% is the change from 819 to 839
Calculation steps:
[( 839 - 819 ) ÷ 819] x 100 = 2.44%
Formula
Percentage change = [(839 - 819) / 819] x 100
Subtract the new number by the original number
839 - 819 = 20
20 ÷ 819 = 0.02442002442002442
0.02442002442002442 x 100 = 2.44%