-3.88% is the change from 851 to 818
Calculation steps:
[( 818 - 851 ) ÷ 851] x 100 = -3.88%
Formula
Percentage change = [(818 - 851) / 851] x 100
Subtract the new number by the original number
818 - 851 = -33
-33 ÷ 851 = -0.038777908343125736
-0.038777908343125736 x 100 = -3.88%