-2.28% is the change from 834 to 815
Calculation steps:
[( 815 - 834 ) ÷ 834] x 100 = -2.28%
Formula
Percentage change = [(815 - 834) / 834] x 100
Subtract the new number by the original number
815 - 834 = -19
-19 ÷ 834 = -0.022781774580335732
-0.022781774580335732 x 100 = -2.28%