-3.57% is the change from 504 to 486
Calculation steps:
[( 486 - 504 ) ÷ 504] x 100 = -3.57%
Formula
Percentage change = [(486 - 504) / 504] x 100
Subtract the new number by the original number
486 - 504 = -18
-18 ÷ 504 = -0.03571428571428571
-0.03571428571428571 x 100 = -3.57%