-74.63% is the change from 871 to 221
Calculation steps:
[( 221 - 871 ) ÷ 871] x 100 = -74.63%
Formula
Percentage change = [(221 - 871) / 871] x 100
Subtract the new number by the original number
221 - 871 = -650
-650 ÷ 871 = -0.746268656716418
-0.746268656716418 x 100 = -74.63%