-5.73% is the change from 873 to 823
Calculation steps:
[( 823 - 873 ) ÷ 873] x 100 = -5.73%
Formula
Percentage change = [(823 - 873) / 873] x 100
Subtract the new number by the original number
823 - 873 = -50
-50 ÷ 873 = -0.0572737686139748
-0.0572737686139748 x 100 = -5.73%