0.49% is the change from 815 to 819
Calculation steps:
[( 819 - 815 ) ÷ 815] x 100 = 0.49%
Formula
Percentage change = [(819 - 815) / 815] x 100
Subtract the new number by the original number
819 - 815 = 4
4 ÷ 815 = 0.0049079754601227
0.0049079754601227 x 100 = 0.49%