-1.96% is the change from 815 to 799
Calculation steps:
[( 799 - 815 ) ÷ 815] x 100 = -1.96%
Formula
Percentage change = [(799 - 815) / 815] x 100
Subtract the new number by the original number
799 - 815 = -16
-16 ÷ 815 = -0.0196319018404908
-0.0196319018404908 x 100 = -1.96%