-26.98% is the change from 871 to 636
Calculation steps:
[( 636 - 871 ) ÷ 871] x 100 = -26.98%
Formula
Percentage change = [(636 - 871) / 871] x 100
Subtract the new number by the original number
636 - 871 = -235
-235 ÷ 871 = -0.269804822043628
-0.269804822043628 x 100 = -26.98%