-45.1% is the change from 909 to 499
Calculation steps:
[( 499 - 909 ) ÷ 909] x 100 = -45.1%
Formula
Percentage change = [(499 - 909) / 909] x 100
Subtract the new number by the original number
499 - 909 = -410
-410 ÷ 909 = -0.45104510451045104
-0.45104510451045104 x 100 = -45.1%