-4.71% is the change from 871 to 830
Calculation steps:
[( 830 - 871 ) ÷ 871] x 100 = -4.71%
Formula
Percentage change = [(830 - 871) / 871] x 100
Subtract the new number by the original number
830 - 871 = -41
-41 ÷ 871 = -0.04707233065442021
-0.04707233065442021 x 100 = -4.71%