-44.13% is the change from 911 to 509
Calculation steps:
[( 509 - 911 ) ÷ 911] x 100 = -44.13%
Formula
Percentage change = [(509 - 911) / 911] x 100
Subtract the new number by the original number
509 - 911 = -402
-402 ÷ 911 = -0.44127332601536773
-0.44127332601536773 x 100 = -44.13%