-0.87% is the change from 917 to 909
Calculation steps:
[( 909 - 917 ) ÷ 917] x 100 = -0.87%
Formula
Percentage change = [(909 - 917) / 917] x 100
Subtract the new number by the original number
909 - 917 = -8
-8 ÷ 917 = -0.008724100327153763
-0.008724100327153763 x 100 = -0.87%