-86.7% is the change from 579 to 77
Calculation steps:
[( 77 - 579 ) ÷ 579] x 100 = -86.7%
Formula
Percentage change = [(77 - 579) / 579] x 100
Subtract the new number by the original number
77 - 579 = -502
-502 ÷ 579 = -0.8670120898100173
-0.8670120898100173 x 100 = -86.7%