-9.37% is the change from 971 to 880
Calculation steps:
[( 880 - 971 ) ÷ 971] x 100 = -9.37%
Formula
Percentage change = [(880 - 971) / 971] x 100
Subtract the new number by the original number
880 - 971 = -91
-91 ÷ 971 = -0.0937178166838311
-0.0937178166838311 x 100 = -9.37%