6.23% is the change from 819 to 870
Calculation steps:
[( 870 - 819 ) ÷ 819] x 100 = 6.23%
Formula
Percentage change = [(870 - 819) / 819] x 100
Subtract the new number by the original number
870 - 819 = 51
51 ÷ 819 = 0.06227106227106227
0.06227106227106227 x 100 = 6.23%