-97.84% is the change from 509 to 11
Calculation steps:
[( 11 - 509 ) ÷ 509] x 100 = -97.84%
Formula
Percentage change = [(11 - 509) / 509] x 100
Subtract the new number by the original number
11 - 509 = -498
-498 ÷ 509 = -0.9783889980353635
-0.9783889980353635 x 100 = -97.84%