-6.3% is the change from 873 to 818
Calculation steps:
[( 818 - 873 ) ÷ 873] x 100 = -6.3%
Formula
Percentage change = [(818 - 873) / 873] x 100
Subtract the new number by the original number
818 - 873 = -55
-55 ÷ 873 = -0.06300114547537228
-0.06300114547537228 x 100 = -6.3%