-0.79% is the change from 507 to 503
Calculation steps:
[( 503 - 507 ) ÷ 507] x 100 = -0.79%
Formula
Percentage change = [(503 - 507) / 507] x 100
Subtract the new number by the original number
503 - 507 = -4
-4 ÷ 507 = -0.007889546351084813
-0.007889546351084813 x 100 = -0.79%