-8.58% is the change from 851 to 778
Calculation steps:
[( 778 - 851 ) ÷ 851] x 100 = -8.58%
Formula
Percentage change = [(778 - 851) / 851] x 100
Subtract the new number by the original number
778 - 851 = -73
-73 ÷ 851 = -0.08578143360752057
-0.08578143360752057 x 100 = -8.58%