-97.46% is the change from 591 to 15
Calculation steps:
[( 15 - 591 ) ÷ 591] x 100 = -97.46%
Formula
Percentage change = [(15 - 591) / 591] x 100
Subtract the new number by the original number
15 - 591 = -576
-576 ÷ 591 = -0.9746192893401016
-0.9746192893401016 x 100 = -97.46%