-96.52% is the change from 517 to 18
Calculation steps:
[( 18 - 517 ) ÷ 517] x 100 = -96.52%
Formula
Percentage change = [(18 - 517) / 517] x 100
Subtract the new number by the original number
18 - 517 = -499
-499 ÷ 517 = -0.965183752417795
-0.965183752417795 x 100 = -96.52%