-3.34% is the change from 509 to 492
Calculation steps:
[( 492 - 509 ) ÷ 509] x 100 = -3.34%
Formula
Percentage change = [(492 - 509) / 509] x 100
Subtract the new number by the original number
492 - 509 = -17
-17 ÷ 509 = -0.03339882121807466
-0.03339882121807466 x 100 = -3.34%