-2.27% is the change from 838 to 819
Calculation steps:
[( 819 - 838 ) ÷ 838] x 100 = -2.27%
Formula
Percentage change = [(819 - 838) / 838] x 100
Subtract the new number by the original number
819 - 838 = -19
-19 ÷ 838 = -0.022673031026252982
-0.022673031026252982 x 100 = -2.27%