-86.52% is the change from 586 to 79
Calculation steps:
[( 79 - 586 ) ÷ 586] x 100 = -86.52%
Formula
Percentage change = [(79 - 586) / 586] x 100
Subtract the new number by the original number
79 - 586 = -507
-507 ÷ 586 = -0.8651877133105802
-0.8651877133105802 x 100 = -86.52%