-1.22% is the change from 819 to 809
Calculation steps:
[( 809 - 819 ) ÷ 819] x 100 = -1.22%
Formula
Percentage change = [(809 - 819) / 819] x 100
Subtract the new number by the original number
809 - 819 = -10
-10 ÷ 819 = -0.01221001221001221
-0.01221001221001221 x 100 = -1.22%