-6.74% is the change from 579 to 540
Calculation steps:
[( 540 - 579 ) ÷ 579] x 100 = -6.74%
Formula
Percentage change = [(540 - 579) / 579] x 100
Subtract the new number by the original number
540 - 579 = -39
-39 ÷ 579 = -0.06735751295336788
-0.06735751295336788 x 100 = -6.74%