-24.11% is the change from 871 to 661
Calculation steps:
[( 661 - 871 ) ÷ 871] x 100 = -24.11%
Formula
Percentage change = [(661 - 871) / 871] x 100
Subtract the new number by the original number
661 - 871 = -210
-210 ÷ 871 = -0.24110218140068887
-0.24110218140068887 x 100 = -24.11%