-23.08% is the change from 871 to 670
Calculation steps:
[( 670 - 871 ) ÷ 871] x 100 = -23.08%
Formula
Percentage change = [(670 - 871) / 871] x 100
Subtract the new number by the original number
670 - 871 = -201
-201 ÷ 871 = -0.23076923076923078
-0.23076923076923078 x 100 = -23.08%