-40.33% is the change from 853 to 509
Calculation steps:
[( 509 - 853 ) ÷ 853] x 100 = -40.33%
Formula
Percentage change = [(509 - 853) / 853] x 100
Subtract the new number by the original number
509 - 853 = -344
-344 ÷ 853 = -0.40328253223915594
-0.40328253223915594 x 100 = -40.33%