-16.5% is the change from 509 to 425
Calculation steps:
[( 425 - 509 ) ÷ 509] x 100 = -16.5%
Formula
Percentage change = [(425 - 509) / 509] x 100
Subtract the new number by the original number
425 - 509 = -84
-84 ÷ 509 = -0.1650294695481336
-0.1650294695481336 x 100 = -16.5%