-97.49% is the change from 517 to 13
Calculation steps:
[( 13 - 517 ) ÷ 517] x 100 = -97.49%
Formula
Percentage change = [(13 - 517) / 517] x 100
Subtract the new number by the original number
13 - 517 = -504
-504 ÷ 517 = -0.9748549323017408
-0.9748549323017408 x 100 = -97.49%