-20.62% is the change from 679 to 539
Calculation steps:
[( 539 - 679 ) ÷ 679] x 100 = -20.62%
Formula
Percentage change = [(539 - 679) / 679] x 100
Subtract the new number by the original number
539 - 679 = -140
-140 ÷ 679 = -0.20618556701030927
-0.20618556701030927 x 100 = -20.62%