-1.44% is the change from 831 to 819
Calculation steps:
[( 819 - 831 ) ÷ 831] x 100 = -1.44%
Formula
Percentage change = [(819 - 831) / 831] x 100
Subtract the new number by the original number
819 - 831 = -12
-12 ÷ 831 = -0.01444043321299639
-0.01444043321299639 x 100 = -1.44%