-70.49% is the change from 871 to 257
Calculation steps:
[( 257 - 871 ) ÷ 871] x 100 = -70.49%
Formula
Percentage change = [(257 - 871) / 871] x 100
Subtract the new number by the original number
257 - 871 = -614
-614 ÷ 871 = -0.7049368541905855
-0.7049368541905855 x 100 = -70.49%