-0.7% is the change from 857 to 851
Calculation steps:
[( 851 - 857 ) ÷ 857] x 100 = -0.7%
Formula
Percentage change = [(851 - 857) / 857] x 100
Subtract the new number by the original number
851 - 857 = -6
-6 ÷ 857 = -0.007001166861143524
-0.007001166861143524 x 100 = -0.7%