-8.99% is the change from 912 to 830
Calculation steps:
[( 830 - 912 ) ÷ 912] x 100 = -8.99%
Formula
Percentage change = [(830 - 912) / 912] x 100
Subtract the new number by the original number
830 - 912 = -82
-82 ÷ 912 = -0.08991228070175439
-0.08991228070175439 x 100 = -8.99%