-26.18% is the change from 871 to 643
Calculation steps:
[( 643 - 871 ) ÷ 871] x 100 = -26.18%
Formula
Percentage change = [(643 - 871) / 871] x 100
Subtract the new number by the original number
643 - 871 = -228
-228 ÷ 871 = -0.2617680826636051
-0.2617680826636051 x 100 = -26.18%