-12.74% is the change from 997 to 870
Calculation steps:
[( 870 - 997 ) ÷ 997] x 100 = -12.74%
Formula
Percentage change = [(870 - 997) / 997] x 100
Subtract the new number by the original number
870 - 997 = -127
-127 ÷ 997 = -0.12738214643931794
-0.12738214643931794 x 100 = -12.74%