-20.47% is the change from 679 to 540
Calculation steps:
[( 540 - 679 ) ÷ 679] x 100 = -20.47%
Formula
Percentage change = [(540 - 679) / 679] x 100
Subtract the new number by the original number
540 - 679 = -139
-139 ÷ 679 = -0.20471281296023564
-0.20471281296023564 x 100 = -20.47%