-1.92% is the change from 887 to 870
Calculation steps:
[( 870 - 887 ) ÷ 887] x 100 = -1.92%
Formula
Percentage change = [(870 - 887) / 887] x 100
Subtract the new number by the original number
870 - 887 = -17
-17 ÷ 887 = -0.019165727170236752
-0.019165727170236752 x 100 = -1.92%