-8.39% is the change from 906 to 830
Calculation steps:
[( 830 - 906 ) ÷ 906] x 100 = -8.39%
Formula
Percentage change = [(830 - 906) / 906] x 100
Subtract the new number by the original number
830 - 906 = -76
-76 ÷ 906 = -0.08388520971302428
-0.08388520971302428 x 100 = -8.39%