-91.72% is the change from 857 to 71
Calculation steps:
[( 71 - 857 ) ÷ 857] x 100 = -91.72%
Formula
Percentage change = [(71 - 857) / 857] x 100
Subtract the new number by the original number
71 - 857 = -786
-786 ÷ 857 = -0.9171528588098017
-0.9171528588098017 x 100 = -91.72%