-9.68% is the change from 919 to 830
Calculation steps:
[( 830 - 919 ) ÷ 919] x 100 = -9.68%
Formula
Percentage change = [(830 - 919) / 919] x 100
Subtract the new number by the original number
830 - 919 = -89
-89 ÷ 919 = -0.09684439608269858
-0.09684439608269858 x 100 = -9.68%