-31.09% is the change from 579 to 399
Calculation steps:
[( 399 - 579 ) ÷ 579] x 100 = -31.09%
Formula
Percentage change = [(399 - 579) / 579] x 100
Subtract the new number by the original number
399 - 579 = -180
-180 ÷ 579 = -0.31088082901554404
-0.31088082901554404 x 100 = -31.09%