-3.1% is the change from 840 to 814
Calculation steps:
[( 814 - 840 ) ÷ 840] x 100 = -3.1%
Formula
Percentage change = [(814 - 840) / 840] x 100
Subtract the new number by the original number
814 - 840 = -26
-26 ÷ 840 = -0.030952380952380953
-0.030952380952380953 x 100 = -3.1%