-10.4% is the change from 971 to 870
Calculation steps:
[( 870 - 971 ) ÷ 971] x 100 = -10.4%
Formula
Percentage change = [(870 - 971) / 971] x 100
Subtract the new number by the original number
870 - 971 = -101
-101 ÷ 971 = -0.10401647785787847
-0.10401647785787847 x 100 = -10.4%