0.12% is the change from 819 to 820
Calculation steps:
[( 820 - 819 ) ÷ 819] x 100 = 0.12%
Formula
Percentage change = [(820 - 819) / 819] x 100
Subtract the new number by the original number
820 - 819 = 1
1 ÷ 819 = 0.001221001221001221
0.001221001221001221 x 100 = 0.12%