-86.63% is the change from 591 to 79
Calculation steps:
[( 79 - 591 ) ÷ 591] x 100 = -86.63%
Formula
Percentage change = [(79 - 591) / 591] x 100
Subtract the new number by the original number
79 - 591 = -512
-512 ÷ 591 = -0.8663282571912013
-0.8663282571912013 x 100 = -86.63%