-1.96% is the change from 509 to 499
Calculation steps:
[( 499 - 509 ) ÷ 509] x 100 = -1.96%
Formula
Percentage change = [(499 - 509) / 509] x 100
Subtract the new number by the original number
499 - 509 = -10
-10 ÷ 509 = -0.019646365422396856
-0.019646365422396856 x 100 = -1.96%