-1.37% is the change from 511 to 504
Calculation steps:
[( 504 - 511 ) ÷ 511] x 100 = -1.37%
Formula
Percentage change = [(504 - 511) / 511] x 100
Subtract the new number by the original number
504 - 511 = -7
-7 ÷ 511 = -0.0136986301369863
-0.0136986301369863 x 100 = -1.37%