-81.97% is the change from 871 to 157
Calculation steps:
[( 157 - 871 ) ÷ 871] x 100 = -81.97%
Formula
Percentage change = [(157 - 871) / 871] x 100
Subtract the new number by the original number
157 - 871 = -714
-714 ÷ 871 = -0.8197474167623421
-0.8197474167623421 x 100 = -81.97%