-71.18% is the change from 871 to 251
Calculation steps:
[( 251 - 871 ) ÷ 871] x 100 = -71.18%
Formula
Percentage change = [(251 - 871) / 871] x 100
Subtract the new number by the original number
251 - 871 = -620
-620 ÷ 871 = -0.711825487944891
-0.711825487944891 x 100 = -71.18%