-18.17% is the change from 666 to 545
Calculation steps:
[( 545 - 666 ) ÷ 666] x 100 = -18.17%
Formula
Percentage change = [(545 - 666) / 666] x 100
Subtract the new number by the original number
545 - 666 = -121
-121 ÷ 666 = -0.1816816816816817
-0.1816816816816817 x 100 = -18.17%