-1.55% is the change from 517 to 509
Calculation steps:
[( 509 - 517 ) ÷ 517] x 100 = -1.55%
Formula
Percentage change = [(509 - 517) / 517] x 100
Subtract the new number by the original number
509 - 517 = -8
-8 ÷ 517 = -0.015473887814313346
-0.015473887814313346 x 100 = -1.55%