-1.15% is the change from 871 to 861
Calculation steps:
[( 861 - 871 ) ÷ 871] x 100 = -1.15%
Formula
Percentage change = [(861 - 871) / 871] x 100
Subtract the new number by the original number
861 - 871 = -10
-10 ÷ 871 = -0.011481056257175661
-0.011481056257175661 x 100 = -1.15%