-41.91% is the change from 871 to 506
Calculation steps:
[( 506 - 871 ) ÷ 871] x 100 = -41.91%
Formula
Percentage change = [(506 - 871) / 871] x 100
Subtract the new number by the original number
506 - 871 = -365
-365 ÷ 871 = -0.4190585533869116
-0.4190585533869116 x 100 = -41.91%