-3.55% is the change from 873 to 842
Calculation steps:
[( 842 - 873 ) ÷ 873] x 100 = -3.55%
Formula
Percentage change = [(842 - 873) / 873] x 100
Subtract the new number by the original number
842 - 873 = -31
-31 ÷ 873 = -0.035509736540664374
-0.035509736540664374 x 100 = -3.55%