-2.52% is the change from 873 to 851
Calculation steps:
[( 851 - 873 ) ÷ 873] x 100 = -2.52%
Formula
Percentage change = [(851 - 873) / 873] x 100
Subtract the new number by the original number
851 - 873 = -22
-22 ÷ 873 = -0.025200458190148912
-0.025200458190148912 x 100 = -2.52%