-0.39% is the change from 507 to 505
Calculation steps:
[( 505 - 507 ) ÷ 507] x 100 = -0.39%
Formula
Percentage change = [(505 - 507) / 507] x 100
Subtract the new number by the original number
505 - 507 = -2
-2 ÷ 507 = -0.0039447731755424065
-0.0039447731755424065 x 100 = -0.39%