-4.47% is the change from 851 to 813
Calculation steps:
[( 813 - 851 ) ÷ 851] x 100 = -4.47%
Formula
Percentage change = [(813 - 851) / 851] x 100
Subtract the new number by the original number
813 - 851 = -38
-38 ÷ 851 = -0.04465334900117509
-0.04465334900117509 x 100 = -4.47%