-99.2% is the change from 873 to 7
Calculation steps:
[( 7 - 873 ) ÷ 873] x 100 = -99.2%
Formula
Percentage change = [(7 - 873) / 873] x 100
Subtract the new number by the original number
7 - 873 = -866
-866 ÷ 873 = -0.9919816723940436
-0.9919816723940436 x 100 = -99.2%