-0.34% is the change from 871 to 868
Calculation steps:
[( 868 - 871 ) ÷ 871] x 100 = -0.34%
Formula
Percentage change = [(868 - 871) / 871] x 100
Subtract the new number by the original number
868 - 871 = -3
-3 ÷ 871 = -0.003444316877152698
-0.003444316877152698 x 100 = -0.34%