-9.92% is the change from 665 to 599
Calculation steps:
[( 599 - 665 ) ÷ 665] x 100 = -9.92%
Formula
Percentage change = [(599 - 665) / 665] x 100
Subtract the new number by the original number
599 - 665 = -66
-66 ÷ 665 = -0.09924812030075188
-0.09924812030075188 x 100 = -9.92%