-40.32% is the change from 873 to 521
Calculation steps:
[( 521 - 873 ) ÷ 873] x 100 = -40.32%
Formula
Percentage change = [(521 - 873) / 873] x 100
Subtract the new number by the original number
521 - 873 = -352
-352 ÷ 873 = -0.4032073310423826
-0.4032073310423826 x 100 = -40.32%