-9.49% is the change from 917 to 830
Calculation steps:
[( 830 - 917 ) ÷ 917] x 100 = -9.49%
Formula
Percentage change = [(830 - 917) / 917] x 100
Subtract the new number by the original number
830 - 917 = -87
-87 ÷ 917 = -0.09487459105779716
-0.09487459105779716 x 100 = -9.49%