-2.51% is the change from 517 to 504
Calculation steps:
[( 504 - 517 ) ÷ 517] x 100 = -2.51%
Formula
Percentage change = [(504 - 517) / 517] x 100
Subtract the new number by the original number
504 - 517 = -13
-13 ÷ 517 = -0.025145067698259187
-0.025145067698259187 x 100 = -2.51%