-3.19% is the change from 502 to 486
Calculation steps:
[( 486 - 502 ) ÷ 502] x 100 = -3.19%
Formula
Percentage change = [(486 - 502) / 502] x 100
Subtract the new number by the original number
486 - 502 = -16
-16 ÷ 502 = -0.03187250996015936
-0.03187250996015936 x 100 = -3.19%