-68.16% is the change from 851 to 271
Calculation steps:
[( 271 - 851 ) ÷ 851] x 100 = -68.16%
Formula
Percentage change = [(271 - 851) / 851] x 100
Subtract the new number by the original number
271 - 851 = -580
-580 ÷ 851 = -0.681551116333725
-0.681551116333725 x 100 = -68.16%