-10.06% is the change from 666 to 599
Calculation steps:
[( 599 - 666 ) ÷ 666] x 100 = -10.06%
Formula
Percentage change = [(599 - 666) / 666] x 100
Subtract the new number by the original number
599 - 666 = -67
-67 ÷ 666 = -0.1006006006006006
-0.1006006006006006 x 100 = -10.06%