-13.06% is the change from 666 to 579
Calculation steps:
[( 579 - 666 ) ÷ 666] x 100 = -13.06%
Formula
Percentage change = [(579 - 666) / 666] x 100
Subtract the new number by the original number
579 - 666 = -87
-87 ÷ 666 = -0.13063063063063063
-0.13063063063063063 x 100 = -13.06%