-97.88% is the change from 518 to 11
Calculation steps:
[( 11 - 518 ) ÷ 518] x 100 = -97.88%
Formula
Percentage change = [(11 - 518) / 518] x 100
Subtract the new number by the original number
11 - 518 = -507
-507 ÷ 518 = -0.9787644787644788
-0.9787644787644788 x 100 = -97.88%