-63.15% is the change from 871 to 321
Calculation steps:
[( 321 - 871 ) ÷ 871] x 100 = -63.15%
Formula
Percentage change = [(321 - 871) / 871] x 100
Subtract the new number by the original number
321 - 871 = -550
-550 ÷ 871 = -0.6314580941446614
-0.6314580941446614 x 100 = -63.15%