-81.49% is the change from 870 to 161
Calculation steps:
[( 161 - 870 ) ÷ 870] x 100 = -81.49%
Formula
Percentage change = [(161 - 870) / 870] x 100
Subtract the new number by the original number
161 - 870 = -709
-709 ÷ 870 = -0.8149425287356322
-0.8149425287356322 x 100 = -81.49%