-18.95% is the change from 665 to 539
Calculation steps:
[( 539 - 665 ) ÷ 665] x 100 = -18.95%
Formula
Percentage change = [(539 - 665) / 665] x 100
Subtract the new number by the original number
539 - 665 = -126
-126 ÷ 665 = -0.18947368421052632
-0.18947368421052632 x 100 = -18.95%