-18.05% is the change from 665 to 545
Calculation steps:
[( 545 - 665 ) ÷ 665] x 100 = -18.05%
Formula
Percentage change = [(545 - 665) / 665] x 100
Subtract the new number by the original number
545 - 665 = -120
-120 ÷ 665 = -0.18045112781954886
-0.18045112781954886 x 100 = -18.05%