-86.97% is the change from 591 to 77
Calculation steps:
[( 77 - 591 ) ÷ 591] x 100 = -86.97%
Formula
Percentage change = [(77 - 591) / 591] x 100
Subtract the new number by the original number
77 - 591 = -514
-514 ÷ 591 = -0.8697123519458545
-0.8697123519458545 x 100 = -86.97%