-3.04% is the change from 856 to 830
Calculation steps:
[( 830 - 856 ) ÷ 856] x 100 = -3.04%
Formula
Percentage change = [(830 - 856) / 856] x 100
Subtract the new number by the original number
830 - 856 = -26
-26 ÷ 856 = -0.030373831775700934
-0.030373831775700934 x 100 = -3.04%