-41.7% is the change from 873 to 509
Calculation steps:
[( 509 - 873 ) ÷ 873] x 100 = -41.7%
Formula
Percentage change = [(509 - 873) / 873] x 100
Subtract the new number by the original number
509 - 873 = -364
-364 ÷ 873 = -0.41695303550973656
-0.41695303550973656 x 100 = -41.7%